399490 has 32 divisors (see below), whose sum is σ = 887040. Its totient is φ = 126144.

The previous prime is 399481. The next prime is 399491. The reversal of 399490 is 94993.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (399491) 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, 691 + ... + 1129.

It is an arithmetic number, because the mean of its divisors is an integer number (27720).

2³⁹⁹⁴⁹⁰ is an apocalyptic number.

399490 is an abundant number, since it is smaller than the sum of its proper divisors (487550).

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

399490 is a wasteful number, since it uses less digits than its factorization.

399490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 399490 is about 632.0522130331. The cubic root of 399490 is about 73.6493023871.

The spelling of 399490 in words is "three hundred ninety-nine thousand, four hundred ninety".