157321986 has 16 divisors (see below), whose sum is σ = 314791968. Its totient is φ = 52416000.

The previous prime is 157321981. The next prime is 157321991. The reversal of 157321986 is 689123751.

It is an interprime number because it is at equal distance from previous prime (157321981) and next prime (157321991).

It is not an unprimeable number, because it can be changed into a prime (157321981) 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, 11586 + ... + 21186.

It is an arithmetic number, because the mean of its divisors is an integer number (19674498).

Almost surely, 2^157321986 is an apocalyptic number.

157321986 is an abundant number, since it is smaller than the sum of its proper divisors (157469982).

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

157321986 is a wasteful number, since it uses less digits than its factorization.

157321986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12337.

The product of its digits is 90720, while the sum is 42.

The square root of 157321986 is about 12542.8061453568. The cubic root of 157321986 is about 539.8376123517.

The spelling of 157321986 in words is "one hundred fifty-seven million, three hundred twenty-one thousand, nine hundred eighty-six".