157982393 has 4 divisors (see below), whose sum is σ = 158138148. Its totient is φ = 157826640.

The previous prime is 157982381. The next prime is 157982399. The reversal of 157982393 is 393289751.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80048809 + 77933584 = 8947^2 + 8828^2 .

It is a cyclic number.

It is not a de Polignac number, because 157982393 - 2¹⁴ = 157966009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (157982399) 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, 76346 + ... + 78387.

It is an arithmetic number, because the mean of its divisors is an integer number (39534537).

Almost surely, 2^157982393 is an apocalyptic number.

It is an amenable number.

157982393 is a deficient number, since it is larger than the sum of its proper divisors (155755).

157982393 is a wasteful number, since it uses less digits than its factorization.

157982393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155754.

The product of its digits is 408240, while the sum is 47.

The square root of 157982393 is about 12569.1047016086. The cubic root of 157982393 is about 540.5919354877.

The spelling of 157982393 in words is "one hundred fifty-seven million, nine hundred eighty-two thousand, three hundred ninety-three".