399908258689 has 9 divisors (see below), whose sum is σ = 424827459907. Its totient is φ = 376374125344.

The previous prime is 399908258683. The next prime is 399908258719. The reversal of 399908258689 is 986852809993.

The square root of 399908258689 is 632383.

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

It can be written as a sum of positive squares in only one way, i.e., 311347260225 + 88560998464 = 557985^2 + 297592^2 .

It is not a de Polignac number, because 399908258689 - 2³ = 399908258681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399908258681) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10731912 + ... + 10769110.

Almost surely, 2^399908258689 is an apocalyptic number.

399908258689 is the 632383-rd square number.

399908258689 is the 316192-nd centered octagonal number.

It is an amenable number.

399908258689 is a deficient number, since it is larger than the sum of its proper divisors (24919201218).

399908258689 is an frugal number, since it uses more digits than its factorization.

399908258689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74432 (or 37216 counting only the distinct ones).

The product of its (nonzero) digits is 604661760, while the sum is 76.

The spelling of 399908258689 in words is "three hundred ninety-nine billion, nine hundred eight million, two hundred fifty-eight thousand, six hundred eighty-nine".