55399139 has 8 divisors (see below), whose sum is σ = 57369600. Its totient is φ = 53440200.

The previous prime is 55399129. The next prime is 55399181. The reversal of 55399139 is 93199355.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55399139 - 2²⁰ = 54350563 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55399139.

It is not an unprimeable number, because it can be changed into a prime (55399129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7562 + ... + 12960.

It is an arithmetic number, because the mean of its divisors is an integer number (7171200).

Almost surely, 2^55399139 is an apocalyptic number.

55399139 is a deficient number, since it is larger than the sum of its proper divisors (1970461).

55399139 is a wasteful number, since it uses less digits than its factorization.

55399139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5761.

The product of its digits is 164025, while the sum is 44.

The square root of 55399139 is about 7443.0597874799. The cubic root of 55399139 is about 381.2129730591.

The spelling of 55399139 in words is "fifty-five million, three hundred ninety-nine thousand, one hundred thirty-nine".