399390 has 16 divisors (see below), whose sum is σ = 958608. Its totient is φ = 106496.

The previous prime is 399389. The next prime is 399391. The reversal of 399390 is 93993.

399390 is nontrivially palindromic in base 9.

399390 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (399389) and next prime (399391).

It is a Curzon number.

It is a zygodrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399391) 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, 6627 + ... + 6686.

It is an arithmetic number, because the mean of its divisors is an integer number (59913).

2³⁹⁹³⁹⁰ is an apocalyptic number.

399390 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

399390 is an abundant number, since it is smaller than the sum of its proper divisors (559218).

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

399390 is a wasteful number, since it uses less digits than its factorization.

399390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13323.

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

The square root of 399390 is about 631.9731006934. The cubic root of 399390 is about 73.6431565971.

The spelling of 399390 in words is "three hundred ninety-nine thousand, three hundred ninety".