399738 has 16 divisors (see below), whose sum is σ = 846720. Its totient is φ = 125376.

The previous prime is 399731. The next prime is 399739. The reversal of 399738 is 837993.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 399696 and 399705.

It is not an unprimeable number, because it can be changed into a prime (399731) 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, 1858 + ... + 2061.

It is an arithmetic number, because the mean of its divisors is an integer number (52920).

2³⁹⁹⁷³⁸ is an apocalyptic number.

399738 is an abundant number, since it is smaller than the sum of its proper divisors (446982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399738 is a wasteful number, since it uses less digits than its factorization.

399738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3941.

The product of its digits is 40824, while the sum is 39.

The square root of 399738 is about 632.2483689184. The cubic root of 399738 is about 73.6645395217.

The spelling of 399738 in words is "three hundred ninety-nine thousand, seven hundred thirty-eight".