247423840 has 24 divisors (see below), whose sum is σ = 584539200. Its totient is φ = 98969472.

The previous prime is 247423837. The next prime is 247423859. The reversal of 247423840 is 48324742.

It is a super-2 number, since 2×247423840² = 122437113200691200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247423796 and 247423805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773040 + ... + 773359.

It is an arithmetic number, because the mean of its divisors is an integer number (24355800).

Almost surely, 2^247423840 is an apocalyptic number.

247423840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

247423840 is an abundant number, since it is smaller than the sum of its proper divisors (337115360).

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

247423840 is a wasteful number, since it uses less digits than its factorization.

247423840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546414 (or 1546406 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 34.

The square root of 247423840 is about 15729.7120126212. The cubic root of 247423840 is about 627.7892107686.

It can be divided in two parts, 24742 and 3840, that added together give a palindrome (28582).

The spelling of 247423840 in words is "two hundred forty-seven million, four hundred twenty-three thousand, eight hundred forty".