55939979 has 16 divisors (see below), whose sum is σ = 62622720. Its totient is φ = 49695360.

The previous prime is 55939951. The next prime is 55939981. The reversal of 55939979 is 97993955.

It is a cyclic number.

It is not a de Polignac number, because 55939979 - 2¹² = 55935883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55939909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29984 + ... + 31794.

It is an arithmetic number, because the mean of its divisors is an integer number (3913920).

Almost surely, 2^55939979 is an apocalyptic number.

55939979 is a deficient number, since it is larger than the sum of its proper divisors (6682741).

55939979 is a wasteful number, since it uses less digits than its factorization.

55939979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930.

The product of its digits is 3444525, while the sum is 56.

The square root of 55939979 is about 7479.3033766521. The cubic root of 55939979 is about 382.4495019270.

The spelling of 55939979 in words is "fifty-five million, nine hundred thirty-nine thousand, nine hundred seventy-nine".