390399 has 8 divisors (see below), whose sum is σ = 524160. Its totient is φ = 258456.

The previous prime is 390391. The next prime is 390407. The reversal of 390399 is 993093.

It is an interprime number because it is at equal distance from previous prime (390391) and next prime (390407).

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

It is not a de Polignac number, because 390399 - 2³ = 390391 is a prime.

It is a super-2 number, since 2×390399² = 304822758402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390391) 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, 174 + ... + 900.

It is an arithmetic number, because the mean of its divisors is an integer number (65520).

2³⁹⁰³⁹⁹ is an apocalyptic number.

390399 is a deficient number, since it is larger than the sum of its proper divisors (133761).

390399 is a wasteful number, since it uses less digits than its factorization.

390399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909.

The product of its (nonzero) digits is 6561, while the sum is 33.

The square root of 390399 is about 624.8191738415. The cubic root of 390399 is about 73.0863430715.

The spelling of 390399 in words is "three hundred ninety thousand, three hundred ninety-nine".