55401986 has 16 divisors (see below), whose sum is σ = 91281600. Its totient is φ = 25101648.

The previous prime is 55401971. The next prime is 55402007. The reversal of 55401986 is 68910455.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30821 + ... + 32568.

It is an arithmetic number, because the mean of its divisors is an integer number (5705100).

Almost surely, 2^55401986 is an apocalyptic number.

55401986 is a deficient number, since it is larger than the sum of its proper divisors (35879614).

55401986 is a wasteful number, since it uses less digits than its factorization.

55401986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63433.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 55401986 is about 7443.2510370133. The cubic root of 55401986 is about 381.2195032132.

The spelling of 55401986 in words is "fifty-five million, four hundred one thousand, nine hundred eighty-six".