399954 has 16 divisors (see below), whose sum is σ = 806400. Its totient is φ = 132240.

The previous prime is 399953. The next prime is 399979. The reversal of 399954 is 459993.

It is a happy 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, 972 + ... + 1320.

It is an arithmetic number, because the mean of its divisors is an integer number (50400).

2³⁹⁹⁹⁵⁴ is an apocalyptic number.

399954 is an abundant number, since it is smaller than the sum of its proper divisors (406446).

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

399954 is a wasteful number, since it uses less digits than its factorization.

399954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545.

The product of its digits is 43740, while the sum is 39.

The square root of 399954 is about 632.4191647950. The cubic root of 399954 is about 73.6778054404.

Adding to 399954 its sum of digits (39), we get a palindrome (399993).

The spelling of 399954 in words is "three hundred ninety-nine thousand, nine hundred fifty-four".