390055666 has 128 divisors (see below), whose sum is σ = 843042816. Its totient is φ = 130394880.

The previous prime is 390055663. The next prime is 390055669. The reversal of 390055666 is 666550093.

390055666 is nontrivially palindromic in base 12.

It is an interprime number because it is at equal distance from previous prime (390055663) and next prime (390055669).

It is not an unprimeable number, because it can be changed into a prime (390055663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1979880 + ... + 1980076.

It is an arithmetic number, because the mean of its divisors is an integer number (6586272).

Almost surely, 2^390055666 is an apocalyptic number.

390055666 is an abundant number, since it is smaller than the sum of its proper divisors (452987150).

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

390055666 is a wasteful number, since it uses less digits than its factorization.

390055666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296.

The product of its (nonzero) digits is 145800, while the sum is 40.

The square root of 390055666 is about 19749.8269865840. The cubic root of 390055666 is about 730.6491167601.

The spelling of 390055666 in words is "three hundred ninety million, fifty-five thousand, six hundred sixty-six".