18061884 has 18 divisors (see below), whose sum is σ = 45656520. Its totient is φ = 6020616.

The previous prime is 18061873. The next prime is 18061889. The reversal of 18061884 is 48816081.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 501719 = 18061884 / (1 + 8 + 0 + 6 + 1 + 8 + 8 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18061889) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 250824 + ... + 250895.

Almost surely, 2^18061884 is an apocalyptic number.

It is an amenable number.

18061884 is an abundant number, since it is smaller than the sum of its proper divisors (27594636).

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

18061884 is a wasteful number, since it uses less digits than its factorization.

18061884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501729 (or 501724 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 18061884 is about 4249.9275287939. The cubic root of 18061884 is about 262.3741328544.

The spelling of 18061884 in words is "eighteen million, sixty-one thousand, eight hundred eighty-four".