18180984 has 32 divisors (see below), whose sum is σ = 46005120. Its totient is φ = 5986656.

The previous prime is 18180983. The next prime is 18180991. The reversal of 18180984 is 48908181.

It is a happy number.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18180983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2572 + ... + 6555.

It is an arithmetic number, because the mean of its divisors is an integer number (1437660).

Almost surely, 2^18180984 is an apocalyptic number.

It is an amenable number.

18180984 is an abundant number, since it is smaller than the sum of its proper divisors (27824136).

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

18180984 is a wasteful number, since it uses less digits than its factorization.

18180984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9219 (or 9215 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 39.

The square root of 18180984 is about 4263.9165095016. The cubic root of 18180984 is about 262.9495679345.

The spelling of 18180984 in words is "eighteen million, one hundred eighty thousand, nine hundred eighty-four".