390502221 has 16 divisors (see below), whose sum is σ = 534177600. Its totient is φ = 253612800.

The previous prime is 390502187. The next prime is 390502237. The reversal of 390502221 is 122205093.

It is not a de Polignac number, because 390502221 - 2¹⁸ = 390240077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 390502191 and 390502200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390502241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47955 + ... + 55503.

It is an arithmetic number, because the mean of its divisors is an integer number (33386100).

Almost surely, 2^390502221 is an apocalyptic number.

It is an amenable number.

390502221 is a deficient number, since it is larger than the sum of its proper divisors (143675379).

390502221 is a wasteful number, since it uses less digits than its factorization.

390502221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7996.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 390502221 is about 19761.1290416312. The cubic root of 390502221 is about 730.9278381598.

The spelling of 390502221 in words is "three hundred ninety million, five hundred two thousand, two hundred twenty-one".