55155138 has 32 divisors (see below), whose sum is σ = 119869440. Its totient is φ = 16854480.

The previous prime is 55155131. The next prime is 55155151. The reversal of 55155138 is 83155155.

It is a junction number, because it is equal to n+sod(n) for n = 55155099 and 55155108.

It is not an unprimeable number, because it can be changed into a prime (55155131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4270 + ... + 11337.

It is an arithmetic number, because the mean of its divisors is an integer number (3745920).

Almost surely, 2^55155138 is an apocalyptic number.

55155138 is an abundant number, since it is smaller than the sum of its proper divisors (64714302).

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

55155138 is a wasteful number, since it uses less digits than its factorization.

55155138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15662.

The product of its digits is 15000, while the sum is 33.

The square root of 55155138 is about 7426.6505236210. The cubic root of 55155138 is about 380.6524755229.

The spelling of 55155138 in words is "fifty-five million, one hundred fifty-five thousand, one hundred thirty-eight".