55139040 has 216 divisors, whose sum is σ = 208805688. Its totient is φ = 13140480.

The previous prime is 55139039. The next prime is 55139047. The reversal of 55139040 is 4093155.

It is a junction number, because it is equal to n+sod(n) for n = 55138995 and 55139013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55139047) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 934531 + ... + 934589.

It is an arithmetic number, because the mean of its divisors is an integer number (966693).

Almost surely, 2^55139040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55139040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104402844).

55139040 is an abundant number, since it is smaller than the sum of its proper divisors (153666648).

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

55139040 is a wasteful number, since it uses less digits than its factorization.

55139040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 55139040 is about 7425.5666450447. The cubic root of 55139040 is about 380.6154385394.

The spelling of 55139040 in words is "fifty-five million, one hundred thirty-nine thousand, forty".