157840657 has 16 divisors (see below), whose sum is σ = 181216000. Its totient is φ = 136266624.

The previous prime is 157840633. The next prime is 157840663. The reversal of 157840657 is 756048751.

It is a de Polignac number, because none of the positive numbers 2^k-157840657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157840607) 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, 15469 + ... + 23557.

It is an arithmetic number, because the mean of its divisors is an integer number (11326000).

Almost surely, 2^157840657 is an apocalyptic number.

It is an amenable number.

157840657 is a deficient number, since it is larger than the sum of its proper divisors (23375343).

157840657 is a wasteful number, since it uses less digits than its factorization.

157840657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8200.

The product of its (nonzero) digits is 235200, while the sum is 43.

The square root of 157840657 is about 12563.4651669036. The cubic root of 157840657 is about 540.4302207074.

The spelling of 157840657 in words is "one hundred fifty-seven million, eight hundred forty thousand, six hundred fifty-seven".