157977999 has 16 divisors (see below), whose sum is σ = 234474240. Its totient is φ = 105123960.

The previous prime is 157977979. The next prime is 157978013. The reversal of 157977999 is 999779751.

It is not a de Polignac number, because 157977999 - 2⁷ = 157977871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157977979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10294 + ... + 20540.

It is an arithmetic number, because the mean of its divisors is an integer number (14654640).

Almost surely, 2^157977999 is an apocalyptic number.

157977999 is a deficient number, since it is larger than the sum of its proper divisors (76496241).

157977999 is a wasteful number, since it uses less digits than its factorization.

157977999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10827 (or 10821 counting only the distinct ones).

The product of its digits is 11252115, while the sum is 63.

The square root of 157977999 is about 12568.9299067184. The cubic root of 157977999 is about 540.5869235727.

The spelling of 157977999 in words is "one hundred fifty-seven million, nine hundred seventy-seven thousand, nine hundred ninety-nine".