390621 has 32 divisors (see below), whose sum is σ = 691200. Its totient is φ = 190080.

The previous prime is 390581. The next prime is 390647. The reversal of 390621 is 126093.

390621 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 390621 - 2⁷ = 390493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

390621 is strictly pandigital in base 7.

It is a Curzon number.

It is a nialpdrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390671) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4345 + ... + 4433.

It is an arithmetic number, because the mean of its divisors is an integer number (21600).

2³⁹⁰⁶²¹ is an apocalyptic number.

It is an amenable number.

390621 is a deficient number, since it is larger than the sum of its proper divisors (300579).

390621 is a wasteful number, since it uses less digits than its factorization.

390621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 390621 is about 624.9967999918. The cubic root of 390621 is about 73.1001939383.

The spelling of 390621 in words is "three hundred ninety thousand, six hundred twenty-one".