157720239 has 6 divisors (see below), whose sum is σ = 227818136. Its totient is φ = 105146820.

The previous prime is 157720217. The next prime is 157720243. The reversal of 157720239 is 932027751.

It is not a de Polignac number, because 157720239 - 2⁵ = 157720207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157720249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8762227 + ... + 8762244.

Almost surely, 2^157720239 is an apocalyptic number.

157720239 is a deficient number, since it is larger than the sum of its proper divisors (70097897).

157720239 is a wasteful number, since it uses less digits than its factorization.

157720239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17524477 (or 17524474 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 157720239 is about 12558.6718644927. The cubic root of 157720239 is about 540.2927527825.

The spelling of 157720239 in words is "one hundred fifty-seven million, seven hundred twenty thousand, two hundred thirty-nine".