399250850769 has 15 divisors (see below), whose sum is σ = 596420259897. Its totient is φ = 266163442668.

The previous prime is 399250850729. The next prime is 399250850783. The reversal of 399250850769 is 967058052993.

The square root of 399250850769 is 631863.

It is a perfect power (a square), and thus also a powerful number.

399250850769 is a `hidden beast` number, since 3 + 9 + 9 + 2 + 508 + 50 + 76 + 9 = 666.

It is not a de Polignac number, because 399250850769 - 2²⁵ = 399217296337 is a prime.

It is a super-2 number, since 2×399250850769² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (399250850729) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 5651664 + ... + 5721870.

Almost surely, 2^399250850769 is an apocalyptic number.

399250850769 is the 631863-rd square number.

399250850769 is the 315932-nd centered octagonal number.

It is an amenable number.

399250850769 is a deficient number, since it is larger than the sum of its proper divisors (197169409128).

399250850769 is an frugal number, since it uses more digits than its factorization.

399250850769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140426 (or 70210 counting only the distinct ones).

The product of its (nonzero) digits is 36741600, while the sum is 63.

The spelling of 399250850769 in words is "three hundred ninety-nine billion, two hundred fifty million, eight hundred fifty thousand, seven hundred sixty-nine".