157239923 has 4 divisors (see below), whose sum is σ = 160206768. Its totient is φ = 154273080.

The previous prime is 157239913. The next prime is 157239947. The reversal of 157239923 is 329932751.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 329932751 = 419 ⋅787429.

It is a cyclic number.

It is not a de Polignac number, because 157239923 - 2²² = 153045619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157239913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1483343 + ... + 1483448.

It is an arithmetic number, because the mean of its divisors is an integer number (40051692).

Almost surely, 2^157239923 is an apocalyptic number.

157239923 is a deficient number, since it is larger than the sum of its proper divisors (2966845).

157239923 is an equidigital number, since it uses as much as digits as its factorization.

157239923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2966844.

The product of its digits is 102060, while the sum is 41.

The square root of 157239923 is about 12539.5344012447. The cubic root of 157239923 is about 539.7437318541.

The spelling of 157239923 in words is "one hundred fifty-seven million, two hundred thirty-nine thousand, nine hundred twenty-three".