399104 has 18 divisors (see below), whose sum is σ = 797160. Its totient is φ = 199424.

The previous prime is 399101. The next prime is 399107. The reversal of 399104 is 401993.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (399101) and next prime (399107).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 524 + ... + 1035.

2³⁹⁹¹⁰⁴ is an apocalyptic number.

It is an amenable number.

399104 is a deficient number, since it is larger than the sum of its proper divisors (398056).

399104 is an equidigital number, since it uses as much as digits as its factorization.

399104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575 (or 1561 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 399104 is about 631.7467847168. The cubic root of 399104 is about 73.6255739735.

The spelling of 399104 in words is "three hundred ninety-nine thousand, one hundred four".