2391506856 has 48 divisors (see below), whose sum is σ = 6716892000. Its totient is φ = 797168304.

The previous prime is 2391506849. The next prime is 2391506893. The reversal of 2391506856 is 6586051932.

2391506856 is a `hidden beast` number, since 2 + 3 + 91 + 506 + 8 + 56 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 613156 + ... + 617043.

It is an arithmetic number, because the mean of its divisors is an integer number (139935250).

Almost surely, 2^2391506856 is an apocalyptic number.

It is an amenable number.

2391506856 is an abundant number, since it is smaller than the sum of its proper divisors (4325385144).

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

2391506856 is a wasteful number, since it uses less digits than its factorization.

2391506856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230220 (or 1230204 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 2391506856 is about 48903.0352432239. The cubic root of 2391506856 is about 1337.2847028306.

The spelling of 2391506856 in words is "two billion, three hundred ninety-one million, five hundred six thousand, eight hundred fifty-six".