157793391 has 12 divisors (see below), whose sum is σ = 260484432. Its totient is φ = 90167616.

The previous prime is 157793387. The next prime is 157793401. The reversal of 157793391 is 193397751.

It is not a de Polignac number, because 157793391 - 2² = 157793387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157793341) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1252266 + ... + 1252391.

It is an arithmetic number, because the mean of its divisors is an integer number (21707036).

Almost surely, 2^157793391 is an apocalyptic number.

157793391 is a deficient number, since it is larger than the sum of its proper divisors (102691041).

157793391 is a wasteful number, since it uses less digits than its factorization.

157793391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2504670 (or 2504667 counting only the distinct ones).

The product of its digits is 178605, while the sum is 45.

The square root of 157793391 is about 12561.5839367494. The cubic root of 157793391 is about 540.3762706764.

The spelling of 157793391 in words is "one hundred fifty-seven million, seven hundred ninety-three thousand, three hundred ninety-one".