247240000 has 140 divisors (see below), whose sum is σ = 701450464. Its totient is φ = 84672000.

The previous prime is 247239997. The next prime is 247240043. The reversal of 247240000 is 42742.

It is a tau number, because it is divible by the number of its divisors (140).

It is a super-2 number, since 2×247240000² = 122255235200000000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 247240000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 279559 + ... + 280441.

Almost surely, 2^247240000 is an apocalyptic number.

247240000 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 247240000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (350725232).

247240000 is an abundant number, since it is smaller than the sum of its proper divisors (454210464).

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

247240000 is an frugal number, since it uses more digits than its factorization.

247240000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922 (or 897 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 247240000 is about 15723.8672088008. The cubic root of 247240000 is about 627.6336863254.

Adding to 247240000 its reverse (42742), we get a palindrome (247282742).

The spelling of 247240000 in words is "two hundred forty-seven million, two hundred forty thousand".