390304321 has 4 divisors (see below), whose sum is σ = 425786544. Its totient is φ = 354822100.

The previous prime is 390304307. The next prime is 390304333. The reversal of 390304321 is 123403093.

It is a happy number.

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: 123403093 = 11 ⋅11218463.

It is a cyclic number.

It is not a de Polignac number, because 390304321 - 2¹¹ = 390302273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390304351) 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, 17741095 + ... + 17741116.

It is an arithmetic number, because the mean of its divisors is an integer number (106446636).

Almost surely, 2^390304321 is an apocalyptic number.

It is an amenable number.

390304321 is a deficient number, since it is larger than the sum of its proper divisors (35482223).

390304321 is a wasteful number, since it uses less digits than its factorization.

390304321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35482222.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 390304321 is about 19756.1211020787. The cubic root of 390304321 is about 730.8043432911.

It can be divided in two parts, 390304 and 321, that added together give a 8-th power (390625 = 5⁸).

The spelling of 390304321 in words is "three hundred ninety million, three hundred four thousand, three hundred twenty-one".