390667221 has 12 divisors (see below), whose sum is σ = 644911072. Its totient is φ = 223238376.

The previous prime is 390667219. The next prime is 390667231. The reversal of 390667221 is 122766093.

It is not a de Polignac number, because 390667221 - 2¹ = 390667219 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 (390667231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3100471 + ... + 3100596.

Almost surely, 2^390667221 is an apocalyptic number.

It is an amenable number.

390667221 is a deficient number, since it is larger than the sum of its proper divisors (254243851).

390667221 is a wasteful number, since it uses less digits than its factorization.

390667221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6201080 (or 6201077 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 390667221 is about 19765.3034633926. The cubic root of 390667221 is about 731.0307706610.

The spelling of 390667221 in words is "three hundred ninety million, six hundred sixty-seven thousand, two hundred twenty-one".