399157 has 8 divisors (see below), whose sum is σ = 440352. Its totient is φ = 358800.

The previous prime is 399151. The next prime is 399163. The reversal of 399157 is 751993.

It is an interprime number because it is at equal distance from previous prime (399151) and next prime (399163).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399157 - 2³ = 399149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1303 + ... + 1579.

It is an arithmetic number, because the mean of its divisors is an integer number (55044).

2³⁹⁹¹⁵⁷ is an apocalyptic number.

It is an amenable number.

399157 is a deficient number, since it is larger than the sum of its proper divisors (41195).

399157 is a wasteful number, since it uses less digits than its factorization.

399157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419.

The product of its digits is 8505, while the sum is 34.

The square root of 399157 is about 631.7887305104. The cubic root of 399157 is about 73.6288329258.

Subtracting 399157 from its reverse (751993), we obtain a square (352836 = 594²).

The spelling of 399157 in words is "three hundred ninety-nine thousand, one hundred fifty-seven".