390666252 has 12 divisors (see below), whose sum is σ = 911554616. Its totient is φ = 130222080.

The previous prime is 390666197. The next prime is 390666257. The reversal of 390666252 is 252666093.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 390666252.

It is not an unprimeable number, because it can be changed into a prime (390666257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16277749 + ... + 16277772.

Almost surely, 2^390666252 is an apocalyptic number.

It is an amenable number.

390666252 is an abundant number, since it is smaller than the sum of its proper divisors (520888364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

390666252 is a wasteful number, since it uses less digits than its factorization.

390666252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32555528 (or 32555526 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 39.

The square root of 390666252 is about 19765.2789507257. The cubic root of 390666252 is about 731.0301662511.

The spelling of 390666252 in words is "three hundred ninety million, six hundred sixty-six thousand, two hundred fifty-two".