157998 has 16 divisors (see below), whose sum is σ = 334800. Its totient is φ = 49536.

The previous prime is 157991. The next prime is 157999. The reversal of 157998 is 899751.

It is a happy number.

157998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 157998.

It is not an unprimeable number, because it can be changed into a prime (157991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 673 + ... + 876.

It is an arithmetic number, because the mean of its divisors is an integer number (20925).

2¹⁵⁷⁹⁹⁸ is an apocalyptic number.

157998 is an abundant number, since it is smaller than the sum of its proper divisors (176802).

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

157998 is a wasteful number, since it uses less digits than its factorization.

157998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571.

The product of its digits is 22680, while the sum is 39.

The square root of 157998 is about 397.4896225060. The cubic root of 157998 is about 54.0609736502.

The spelling of 157998 in words is "one hundred fifty-seven thousand, nine hundred ninety-eight".