6390666 has 12 divisors (see below), whose sum is σ = 13846482. Its totient is φ = 2130216.

The previous prime is 6390653. The next prime is 6390679. The reversal of 6390666 is 6660936.

It is an interprime number because it is at equal distance from previous prime (6390653) and next prime (6390679).

It can be written as a sum of positive squares in only one way, i.e., 5659641 + 731025 = 2379^2 + 855^2 .

It is a super-2 number, since 2×6390666² = 81681223847112, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6390666.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 177501 + ... + 177536.

Almost surely, 2^6390666 is an apocalyptic number.

6390666 is an abundant number, since it is smaller than the sum of its proper divisors (7455816).

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

6390666 is a wasteful number, since it uses less digits than its factorization.

6390666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355045 (or 355042 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The square root of 6390666 is about 2527.9766612847. The cubic root of 6390666 is about 185.5732498668.

It can be divided in two parts, 6390 and 666, that added together give a square (7056 = 84²).

The spelling of 6390666 in words is "six million, three hundred ninety thousand, six hundred sixty-six".