6406866 has 12 divisors (see below), whose sum is σ = 13881582. Its totient is φ = 2135616.

The previous prime is 6406861. The next prime is 6406867. The reversal of 6406866 is 6686046.

6406866 is a `hidden beast` number, since 640 + 6 + 8 + 6 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6395841 + 11025 = 2529^2 + 105^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6406866.

It is not an unprimeable number, because it can be changed into a prime (6406861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 177951 + ... + 177986.

Almost surely, 2^6406866 is an apocalyptic number.

6406866 is an abundant number, since it is smaller than the sum of its proper divisors (7474716).

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

6406866 is a wasteful number, since it uses less digits than its factorization.

6406866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355945 (or 355942 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 6406866 is about 2531.1787767758. The cubic root of 6406866 is about 185.7299236761.

The spelling of 6406866 in words is "six million, four hundred six thousand, eight hundred sixty-six".