399257123567 has 8 divisors (see below), whose sum is σ = 429673048272. Its totient is φ = 369611222400.

The previous prime is 399257123513. The next prime is 399257123591. The reversal of 399257123567 is 765321752993.

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 399257123567 - 2²² = 399252929263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399257123467) 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, 192504809 + ... + 192506882.

It is an arithmetic number, because the mean of its divisors is an integer number (53709131034).

Almost surely, 2^399257123567 is an apocalyptic number.

399257123567 is a deficient number, since it is larger than the sum of its proper divisors (30415924705).

399257123567 is a wasteful number, since it uses less digits than its factorization.

399257123567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385011769.

The product of its digits is 21432600, while the sum is 59.

The spelling of 399257123567 in words is "three hundred ninety-nine billion, two hundred fifty-seven million, one hundred twenty-three thousand, five hundred sixty-seven".