399567157 has 4 divisors (see below), whose sum is σ = 435891456. Its totient is φ = 363242860.

The previous prime is 399567149. The next prime is 399567187. The reversal of 399567157 is 751765993.

It is a happy number.

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 not a de Polignac number, because 399567157 - 2³ = 399567149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399567127) 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, 18162133 + ... + 18162154.

It is an arithmetic number, because the mean of its divisors is an integer number (108972864).

Almost surely, 2^399567157 is an apocalyptic number.

It is an amenable number.

399567157 is a deficient number, since it is larger than the sum of its proper divisors (36324299).

399567157 is a wasteful number, since it uses less digits than its factorization.

399567157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36324298.

The product of its digits is 1786050, while the sum is 52.

The square root of 399567157 is about 19989.1759960234. The cubic root of 399567157 is about 736.5404359329.

The spelling of 399567157 in words is "three hundred ninety-nine million, five hundred sixty-seven thousand, one hundred fifty-seven".