156983994 has 20 divisors (see below), whose sum is σ = 351760794. Its totient is φ = 52327944.

The previous prime is 156983987. The next prime is 156984011. The reversal of 156983994 is 499389651.

It can be written as a sum of positive squares in only one way, i.e., 140067225 + 16916769 = 11835^2 + 4113^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 156983994.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 484357 + ... + 484680.

Almost surely, 2^156983994 is an apocalyptic number.

156983994 is an abundant number, since it is smaller than the sum of its proper divisors (194776800).

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

156983994 is an equidigital number, since it uses as much as digits as its factorization.

156983994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969051 (or 969042 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 156983994 is about 12529.3253609283. The cubic root of 156983994 is about 539.4507378025.

The spelling of 156983994 in words is "one hundred fifty-six million, nine hundred eighty-three thousand, nine hundred ninety-four".