55983921 has 12 divisors (see below), whose sum is σ = 86832432. Its totient is φ = 31990728.

The previous prime is 55983913. The next prime is 55983947. The reversal of 55983921 is 12938955.

It is not a de Polignac number, because 55983921 - 2³ = 55983913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55983971) 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, 190275 + ... + 190568.

It is an arithmetic number, because the mean of its divisors is an integer number (7236036).

Almost surely, 2^55983921 is an apocalyptic number.

It is an amenable number.

55983921 is a deficient number, since it is larger than the sum of its proper divisors (30848511).

55983921 is a wasteful number, since it uses less digits than its factorization.

55983921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380860 (or 380853 counting only the distinct ones).

The product of its digits is 97200, while the sum is 42.

The square root of 55983921 is about 7482.2403730434. The cubic root of 55983921 is about 382.5496163583.

The spelling of 55983921 in words is "fifty-five million, nine hundred eighty-three thousand, nine hundred twenty-one".