399239577 has 64 divisors (see below), whose sum is σ = 690508800. Its totient is φ = 225296640.

The previous prime is 399239557. The next prime is 399239579. The reversal of 399239577 is 775932993.

399239577 is a `hidden beast` number, since 39 + 9 + 2 + 39 + 577 = 666.

It is not a de Polignac number, because 399239577 - 2¹¹ = 399237529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399239579) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 539874 + ... + 540612.

It is an arithmetic number, because the mean of its divisors is an integer number (10789200).

Almost surely, 2^399239577 is an apocalyptic number.

It is an amenable number.

399239577 is a deficient number, since it is larger than the sum of its proper divisors (291269223).

399239577 is a wasteful number, since it uses less digits than its factorization.

399239577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883 (or 877 counting only the distinct ones).

The product of its digits is 3214890, while the sum is 54.

The square root of 399239577 is about 19980.9803813527. The cubic root of 399239577 is about 736.3390998309.

The spelling of 399239577 in words is "three hundred ninety-nine million, two hundred thirty-nine thousand, five hundred seventy-seven".