399951 has 8 divisors (see below), whose sum is σ = 592560. Its totient is φ = 266616.

The previous prime is 399941. The next prime is 399953. The reversal of 399951 is 159993.

399951 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 399951 - 2⁶ = 399887 is a prime.

399951 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399953) 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, 7380 + ... + 7433.

It is an arithmetic number, because the mean of its divisors is an integer number (74070).

2³⁹⁹⁹⁵¹ is an apocalyptic number.

399951 is a deficient number, since it is larger than the sum of its proper divisors (192609).

399951 is a wasteful number, since it uses less digits than its factorization.

399951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14822 (or 14816 counting only the distinct ones).

The product of its digits is 10935, while the sum is 36.

The square root of 399951 is about 632.4167929459. The cubic root of 399951 is about 73.6776212242.

The spelling of 399951 in words is "three hundred ninety-nine thousand, nine hundred fifty-one".