157318393 has 4 divisors (see below), whose sum is σ = 158450320. Its totient is φ = 156186468.

The previous prime is 157318379. The next prime is 157318409. The reversal of 157318393 is 393813751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157318393 is a prime.

It is a super-3 number, since 3×157318393³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157318193) 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, 565755 + ... + 566032.

It is an arithmetic number, because the mean of its divisors is an integer number (39612580).

Almost surely, 2^157318393 is an apocalyptic number.

It is an amenable number.

157318393 is a deficient number, since it is larger than the sum of its proper divisors (1131927).

157318393 is a wasteful number, since it uses less digits than its factorization.

157318393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131926.

The product of its digits is 68040, while the sum is 40.

The square root of 157318393 is about 12542.6629150273. The cubic root of 157318393 is about 539.8335026246.

The spelling of 157318393 in words is "one hundred fifty-seven million, three hundred eighteen thousand, three hundred ninety-three".