247434840 has 96 divisors (see below), whose sum is σ = 812092320. Its totient is φ = 65332224.

The previous prime is 247434833. The next prime is 247434841. The reversal of 247434840 is 48434742.

It is a happy number.

It is a super-2 number, since 2×247434840² = 122448000091651200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 247434795 and 247434804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247434841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33744 + ... + 40416.

It is an arithmetic number, because the mean of its divisors is an integer number (8459295).

Almost surely, 2^247434840 is an apocalyptic number.

247434840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 247434840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (406046160).

247434840 is an abundant number, since it is smaller than the sum of its proper divisors (564657480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

247434840 is a wasteful number, since it uses less digits than its factorization.

247434840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6793 (or 6786 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 36.

The square root of 247434840 is about 15730.0616654862. The cubic root of 247434840 is about 627.7985140745.

The spelling of 247434840 in words is "two hundred forty-seven million, four hundred thirty-four thousand, eight hundred forty".