157155978 has 16 divisors (see below), whose sum is σ = 359213760. Its totient is φ = 44901696.

The previous prime is 157155967. The next prime is 157155991. The reversal of 157155978 is 879551751.

It is a happy number.

It is a super-2 number, since 2×157155978² = 49396002842272968, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1870863 + ... + 1870946.

It is an arithmetic number, because the mean of its divisors is an integer number (22450860).

Almost surely, 2^157155978 is an apocalyptic number.

157155978 is an abundant number, since it is smaller than the sum of its proper divisors (202057782).

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

157155978 is a wasteful number, since it uses less digits than its factorization.

157155978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3741821.

The product of its digits is 441000, while the sum is 48.

The square root of 157155978 is about 12536.1867407916. The cubic root of 157155978 is about 539.6476645365.

The spelling of 157155978 in words is "one hundred fifty-seven million, one hundred fifty-five thousand, nine hundred seventy-eight".