55397979 has 48 divisors (see below), whose sum is σ = 102846240. Its totient is φ = 29211840.

The previous prime is 55397971. The next prime is 55397981. The reversal of 55397979 is 97979355.

It is not a de Polignac number, because 55397979 - 2³ = 55397971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55397971) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15589 + ... + 18809.

It is an arithmetic number, because the mean of its divisors is an integer number (2142630).

Almost surely, 2^55397979 is an apocalyptic number.

55397979 is a deficient number, since it is larger than the sum of its proper divisors (47448261).

55397979 is a wasteful number, since it uses less digits than its factorization.

55397979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3257 (or 3244 counting only the distinct ones).

The product of its digits is 2679075, while the sum is 54.

The square root of 55397979 is about 7442.9818621303. The cubic root of 55397979 is about 381.2103123069.

The spelling of 55397979 in words is "fifty-five million, three hundred ninety-seven thousand, nine hundred seventy-nine".