390929321 has 4 divisors (see below), whose sum is σ = 407926272. Its totient is φ = 373932372.

The previous prime is 390929317. The next prime is 390929323. The reversal of 390929321 is 123929093.

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, and also an emirpimes, since its reverse is a distinct semiprime: 123929093 = 29 ⋅4273417.

It is a cyclic number.

It is not a de Polignac number, because 390929321 - 2² = 390929317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390929323) 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, 8498441 + ... + 8498486.

It is an arithmetic number, because the mean of its divisors is an integer number (101981568).

Almost surely, 2^390929321 is an apocalyptic number.

It is an amenable number.

390929321 is a deficient number, since it is larger than the sum of its proper divisors (16996951).

390929321 is a wasteful number, since it uses less digits than its factorization.

390929321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16996950.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 390929321 is about 19771.9326571785. The cubic root of 390929321 is about 731.1942178112.

The spelling of 390929321 in words is "three hundred ninety million, nine hundred twenty-nine thousand, three hundred twenty-one".