55439975 has 12 divisors (see below), whose sum is σ = 72789984. Its totient is φ = 41742720.

The previous prime is 55439957. The next prime is 55439977. The reversal of 55439975 is 57993455.

It is not a de Polignac number, because 55439975 - 2⁸ = 55439719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55439977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64799 + ... + 65648.

It is an arithmetic number, because the mean of its divisors is an integer number (6065832).

Almost surely, 2^55439975 is an apocalyptic number.

55439975 is a deficient number, since it is larger than the sum of its proper divisors (17350009).

55439975 is a wasteful number, since it uses less digits than its factorization.

55439975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130474 (or 130469 counting only the distinct ones).

The product of its digits is 850500, while the sum is 47.

The square root of 55439975 is about 7445.8025087965. The cubic root of 55439975 is about 381.3066170508.

The spelling of 55439975 in words is "fifty-five million, four hundred thirty-nine thousand, nine hundred seventy-five".