399580 has 12 divisors (see below), whose sum is σ = 839160. Its totient is φ = 159824.

The previous prime is 399577. The next prime is 399583. The reversal of 399580 is 85993.

It is an interprime number because it is at equal distance from previous prime (399577) and next prime (399583).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9970 + ... + 10009.

It is an arithmetic number, because the mean of its divisors is an integer number (69930).

2³⁹⁹⁵⁸⁰ is an apocalyptic number.

It is an amenable number.

399580 is an abundant number, since it is smaller than the sum of its proper divisors (439580).

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

399580 is a wasteful number, since it uses less digits than its factorization.

399580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19988 (or 19986 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 399580 is about 632.1234056733. The cubic root of 399580 is about 73.6548327212.

It can be divided in two parts, 3995 and 80, that multiplied together give a triangular number (319600 = T₇₉₉).

The spelling of 399580 in words is "three hundred ninety-nine thousand, five hundred eighty".