390020321 has 4 divisors (see below), whose sum is σ = 391503552. Its totient is φ = 388537092.

The previous prime is 390020311. The next prime is 390020327. The reversal of 390020321 is 123020093.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 390020321 - 2¹⁰ = 390019297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 390020293 and 390020302.

It is not an unprimeable number, because it can be changed into a prime (390020327) 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, 741221 + ... + 741746.

It is an arithmetic number, because the mean of its divisors is an integer number (97875888).

Almost surely, 2^390020321 is an apocalyptic number.

It is an amenable number.

390020321 is a deficient number, since it is larger than the sum of its proper divisors (1483231).

390020321 is a wasteful number, since it uses less digits than its factorization.

390020321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483230.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 390020321 is about 19748.9321483467. The cubic root of 390020321 is about 730.6270467708.

The spelling of 390020321 in words is "three hundred ninety million, twenty thousand, three hundred twenty-one".