55389939 has 16 divisors (see below), whose sum is σ = 81025920. Its totient is φ = 33378560.

The previous prime is 55389937. The next prime is 55389953. The reversal of 55389939 is 93998355.

It is a cyclic number.

It is not a de Polignac number, because 55389939 - 2¹ = 55389937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55389891 and 55389900.

It is not an unprimeable number, because it can be changed into a prime (55389931) 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, 1219 + ... + 10595.

It is an arithmetic number, because the mean of its divisors is an integer number (5064120).

Almost surely, 2^55389939 is an apocalyptic number.

55389939 is a deficient number, since it is larger than the sum of its proper divisors (25635981).

55389939 is a wasteful number, since it uses less digits than its factorization.

55389939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9570.

The product of its digits is 1312200, while the sum is 51.

The square root of 55389939 is about 7442.4417364196. The cubic root of 55389939 is about 381.1918695210.

The spelling of 55389939 in words is "fifty-five million, three hundred eighty-nine thousand, nine hundred thirty-nine".