56399866 has 8 divisors (see below), whose sum is σ = 89052480. Its totient is φ = 26715708.

The previous prime is 56399851. The next prime is 56399879. The reversal of 56399866 is 66899365.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 742066 + ... + 742141.

It is an arithmetic number, because the mean of its divisors is an integer number (11131560).

Almost surely, 2^56399866 is an apocalyptic number.

56399866 is a deficient number, since it is larger than the sum of its proper divisors (32652614).

56399866 is a wasteful number, since it uses less digits than its factorization.

56399866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1484228.

The product of its digits is 2099520, while the sum is 52.

The square root of 56399866 is about 7509.9844207561. The cubic root of 56399866 is about 383.4946921611.

The spelling of 56399866 in words is "fifty-six million, three hundred ninety-nine thousand, eight hundred sixty-six".