390134221 has 4 divisors (see below), whose sum is σ = 393206272. Its totient is φ = 387062172.

The previous prime is 390134209. The next prime is 390134249. The reversal of 390134221 is 122431093.

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 390134221 - 2⁷ = 390134093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390134621) 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, 1535835 + ... + 1536088.

It is an arithmetic number, because the mean of its divisors is an integer number (98301568).

Almost surely, 2^390134221 is an apocalyptic number.

It is an amenable number.

390134221 is a deficient number, since it is larger than the sum of its proper divisors (3072051).

390134221 is a wasteful number, since it uses less digits than its factorization.

390134221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3072050.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 390134221 is about 19751.8156380622. The cubic root of 390134221 is about 730.6981629978.

It can be divided in two parts, 39013 and 4221, that added together give a palindrome (43234).

The spelling of 390134221 in words is "three hundred ninety million, one hundred thirty-four thousand, two hundred twenty-one".