55140018 has 16 divisors (see below), whose sum is σ = 112845216. Its totient is φ = 17952480.

The previous prime is 55140017. The next prime is 55140023. The reversal of 55140018 is 81004155.

It is a self number, because there is not a number n which added to its sum of digits gives 55140018.

It is not an unprimeable number, because it can be changed into a prime (55140011) 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, 106603 + ... + 107118.

It is an arithmetic number, because the mean of its divisors is an integer number (7052826).

Almost surely, 2^55140018 is an apocalyptic number.

55140018 is an abundant number, since it is smaller than the sum of its proper divisors (57705198).

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

55140018 is a wasteful number, since it uses less digits than its factorization.

55140018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213769.

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 55140018 is about 7425.6324983129. The cubic root of 55140018 is about 380.6176888488.

The spelling of 55140018 in words is "fifty-five million, one hundred forty thousand, eighteen".