55389985 has 16 divisors (see below), whose sum is σ = 76665600. Its totient is φ = 37630656.

The previous prime is 55389973. The next prime is 55389989. The reversal of 55389985 is 58998355.

55389985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55389985 - 2⁵ = 55389953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55389989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3445 + ... + 11074.

It is an arithmetic number, because the mean of its divisors is an integer number (4791600).

Almost surely, 2^55389985 is an apocalyptic number.

It is an amenable number.

55389985 is a deficient number, since it is larger than the sum of its proper divisors (21275615).

55389985 is a wasteful number, since it uses less digits than its factorization.

55389985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14640.

The product of its digits is 1944000, while the sum is 52.

The square root of 55389985 is about 7442.4448268025. Note that the first 3 decimals coincide. The cubic root of 55389985 is about 381.1919750445.

The spelling of 55389985 in words is "fifty-five million, three hundred eighty-nine thousand, nine hundred eighty-five".