399769857 has 8 divisors (see below), whose sum is σ = 592251680. Its totient is φ = 266513220.

The previous prime is 399769849. The next prime is 399769859. The reversal of 399769857 is 758967993.

It is not a de Polignac number, because 399769857 - 2³ = 399769849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399769794 and 399769803.

It is not an unprimeable number, because it can be changed into a prime (399769859) 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, 7403119 + ... + 7403172.

It is an arithmetic number, because the mean of its divisors is an integer number (74031460).

Almost surely, 2^399769857 is an apocalyptic number.

It is an amenable number.

399769857 is a deficient number, since it is larger than the sum of its proper divisors (192481823).

399769857 is a wasteful number, since it uses less digits than its factorization.

399769857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14806300 (or 14806294 counting only the distinct ones).

The product of its digits is 25719120, while the sum is 63.

The square root of 399769857 is about 19994.2455971712. The cubic root of 399769857 is about 736.6649636081.

The spelling of 399769857 in words is "three hundred ninety-nine million, seven hundred sixty-nine thousand, eight hundred fifty-seven".