55390239 has 6 divisors (see below), whose sum is σ = 80008136. Its totient is φ = 36926820.

The previous prime is 55390219. The next prime is 55390241. The reversal of 55390239 is 93209355.

55390239 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 55390239 - 2²¹ = 53293087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55390219) 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 5 ways as a sum of consecutive naturals, for example, 3077227 + ... + 3077244.

Almost surely, 2^55390239 is an apocalyptic number.

55390239 is a deficient number, since it is larger than the sum of its proper divisors (24617897).

55390239 is a wasteful number, since it uses less digits than its factorization.

55390239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6154477 (or 6154474 counting only the distinct ones).

The product of its (nonzero) digits is 36450, while the sum is 36.

The square root of 55390239 is about 7442.4618910680. The cubic root of 55390239 is about 381.1925577168.

The spelling of 55390239 in words is "fifty-five million, three hundred ninety thousand, two hundred thirty-nine".