399955251 has 16 divisors (see below), whose sum is σ = 540868896. Its totient is φ = 262864896.

The previous prime is 399955249. The next prime is 399955261. The reversal of 399955251 is 152559993.

It is not a de Polignac number, because 399955251 - 2¹ = 399955249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399955251.

It is not an unprimeable number, because it can be changed into a prime (399955261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62371 + ... + 68483.

It is an arithmetic number, because the mean of its divisors is an integer number (33804306).

Almost surely, 2^399955251 is an apocalyptic number.

399955251 is a deficient number, since it is larger than the sum of its proper divisors (140913645).

399955251 is a wasteful number, since it uses less digits than its factorization.

399955251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6422.

The product of its digits is 546750, while the sum is 48.

The square root of 399955251 is about 19998.8812437096. The cubic root of 399955251 is about 736.7788225825.

The spelling of 399955251 in words is "three hundred ninety-nine million, nine hundred fifty-five thousand, two hundred fifty-one".