55939839 has 4 divisors (see below), whose sum is σ = 74586456. Its totient is φ = 37293224.

The previous prime is 55939813. The next prime is 55939879. The reversal of 55939839 is 93893955.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55939839 - 2⁷ = 55939711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55939791 and 55939800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55939879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9323304 + ... + 9323309.

It is an arithmetic number, because the mean of its divisors is an integer number (18646614).

Almost surely, 2^55939839 is an apocalyptic number.

55939839 is a deficient number, since it is larger than the sum of its proper divisors (18646617).

55939839 is a wasteful number, since it uses less digits than its factorization.

55939839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18646616.

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

The square root of 55939839 is about 7479.2940174859. The cubic root of 55939839 is about 382.4491828769.

The spelling of 55939839 in words is "fifty-five million, nine hundred thirty-nine thousand, eight hundred thirty-nine".