158991900 has 36 divisors (see below), whose sum is σ = 460017432. Its totient is φ = 42397760.

The previous prime is 158991887. The next prime is 158991979. The reversal of 158991900 is 9199851.

It is a super-2 number, since 2×158991900² = 50556848531220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 264687 + ... + 265286.

It is an arithmetic number, because the mean of its divisors is an integer number (12778262).

Almost surely, 2^158991900 is an apocalyptic number.

158991900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

158991900 is an abundant number, since it is smaller than the sum of its proper divisors (301025532).

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

158991900 is a wasteful number, since it uses less digits than its factorization.

158991900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529990 (or 529983 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 42.

The square root of 158991900 is about 12609.1990229356. The cubic root of 158991900 is about 541.7409518106.

The spelling of 158991900 in words is "one hundred fifty-eight million, nine hundred ninety-one thousand, nine hundred".