2156904342 has 32 divisors (see below), whose sum is σ = 5075071200. Its totient is φ = 676675584.

The previous prime is 2156904313. The next prime is 2156904371. The reversal of 2156904342 is 2434096512.

It is a happy number.

2156904342 is a `hidden beast` number, since 215 + 6 + 9 + 0 + 434 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (2156904313) and next prime (2156904371).

It is a junction number, because it is equal to n+sod(n) for n = 2156904297 and 2156904306.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1173867 + ... + 1175702.

It is an arithmetic number, because the mean of its divisors is an integer number (158595975).

Almost surely, 2^2156904342 is an apocalyptic number.

2156904342 is an abundant number, since it is smaller than the sum of its proper divisors (2918166858).

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

2156904342 is a wasteful number, since it uses less digits than its factorization.

2156904342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2349597 (or 2349591 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 2156904342 is about 46442.4842358804. The cubic root of 2156904342 is about 1292.0429823841.

The spelling of 2156904342 in words is "two billion, one hundred fifty-six million, nine hundred four thousand, three hundred forty-two".