399368057 has 4 divisors (see below), whose sum is σ = 435674256. Its totient is φ = 363061860.

The previous prime is 399368033. The next prime is 399368111. The reversal of 399368057 is 750863993.

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, and also an emirpimes, since its reverse is a distinct semiprime: 750863993 = 11 ⋅68260363.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399368057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399367996 and 399368014.

It is not an unprimeable number, because it can be changed into a prime (399368027) 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, 18153083 + ... + 18153104.

It is an arithmetic number, because the mean of its divisors is an integer number (108918564).

Almost surely, 2^399368057 is an apocalyptic number.

It is an amenable number.

399368057 is a deficient number, since it is larger than the sum of its proper divisors (36306199).

399368057 is a wasteful number, since it uses less digits than its factorization.

399368057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36306198.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The square root of 399368057 is about 19984.1951801918. The cubic root of 399368057 is about 736.4180788922.

The spelling of 399368057 in words is "three hundred ninety-nine million, three hundred sixty-eight thousand, fifty-seven".