157998996 has 18 divisors (see below), whose sum is σ = 399386442. Its totient is φ = 52666320.

The previous prime is 157998979. The next prime is 157999021. The reversal of 157998996 is 699899751.

It can be written as a sum of positive squares in only one way, i.e., 84382596 + 73616400 = 9186^2 + 8580^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2194395 + ... + 2194466.

Almost surely, 2^157998996 is an apocalyptic number.

It is an amenable number.

157998996 is an abundant number, since it is smaller than the sum of its proper divisors (241387446).

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

157998996 is a wasteful number, since it uses less digits than its factorization.

157998996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4388871 (or 4388866 counting only the distinct ones).

The product of its digits is 11022480, while the sum is 63.

The square root of 157998996 is about 12569.7651529374. The cubic root of 157998996 is about 540.6108724788.

The spelling of 157998996 in words is "one hundred fifty-seven million, nine hundred ninety-eight thousand, nine hundred ninety-six".