18690055 has 32 divisors (see below), whose sum is σ = 25256448. Its totient is φ = 13209600.

The previous prime is 18690047. The next prime is 18690059. The reversal of 18690055 is 55009681.

It is not a de Polignac number, because 18690055 - 2³ = 18690047 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 18690055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18690059) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 107949 + ... + 108121.

It is an arithmetic number, because the mean of its divisors is an integer number (789264).

Almost surely, 2^18690055 is an apocalyptic number.

18690055 is a deficient number, since it is larger than the sum of its proper divisors (6566393).

18690055 is a wasteful number, since it uses less digits than its factorization.

18690055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 18690055 is about 4323.1996252776. The cubic root of 18690055 is about 265.3812241877.

The spelling of 18690055 in words is "eighteen million, six hundred ninety thousand, fifty-five".