55139718 has 8 divisors (see below), whose sum is σ = 110279448. Its totient is φ = 18379904.

The previous prime is 55139681. The next prime is 55139719. The reversal of 55139718 is 81793155.

55139718 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

55139718 is an admirable number.

It is a super-2 number, since 2×55139718² = 6080777002239048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55139719) 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 3 ways as a sum of consecutive naturals, for example, 4594971 + ... + 4594982.

It is an arithmetic number, because the mean of its divisors is an integer number (13784931).

Almost surely, 2^55139718 is an apocalyptic number.

55139718 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55139718 is a wasteful number, since it uses less digits than its factorization.

55139718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9189958.

The product of its digits is 37800, while the sum is 39.

The square root of 55139718 is about 7425.6122979859. The cubic root of 55139718 is about 380.6169985726.

The spelling of 55139718 in words is "fifty-five million, one hundred thirty-nine thousand, seven hundred eighteen".