399578 has 8 divisors (see below), whose sum is σ = 602580. Its totient is φ = 198720.

The previous prime is 399577. The next prime is 399583. The reversal of 399578 is 875993.

It can be written as a sum of positive squares in 2 ways, for example, as 388129 + 11449 = 623^2 + 107^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (399571) 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, 68 + ... + 896.

2³⁹⁹⁵⁷⁸ is an apocalyptic number.

399578 is a deficient number, since it is larger than the sum of its proper divisors (203002).

399578 is a wasteful number, since it uses less digits than its factorization.

399578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072.

The product of its digits is 68040, while the sum is 41.

The square root of 399578 is about 632.1218237017. The cubic root of 399578 is about 73.6547098339.

The spelling of 399578 in words is "three hundred ninety-nine thousand, five hundred seventy-eight".