156993956 has 12 divisors (see below), whose sum is σ = 313987968. Its totient is φ = 67283112.

The previous prime is 156993943. The next prime is 156993983. The reversal of 156993956 is 659399651.

156993956 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 156993898 and 156993907.

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 3 ways as a sum of consecutive naturals, for example, 2803436 + ... + 2803491.

It is an arithmetic number, because the mean of its divisors is an integer number (26165664).

Almost surely, 2^156993956 is an apocalyptic number.

It is an amenable number.

156993956 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

156993956 is a wasteful number, since it uses less digits than its factorization.

156993956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5606938 (or 5606936 counting only the distinct ones).

The product of its digits is 1968300, while the sum is 53.

The square root of 156993956 is about 12529.7229019640. The cubic root of 156993956 is about 539.4621485084.

The spelling of 156993956 in words is "one hundred fifty-six million, nine hundred ninety-three thousand, nine hundred fifty-six".