18187980 has 48 divisors (see below), whose sum is σ = 51184224. Its totient is φ = 4825600.

The previous prime is 18187973. The next prime is 18187987. The reversal of 18187980 is 8978181.

It is an interprime number because it is at equal distance from previous prime (18187973) and next prime (18187987).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18187987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13330 + ... + 14630.

It is an arithmetic number, because the mean of its divisors is an integer number (1066338).

Almost surely, 2^18187980 is an apocalyptic number.

18187980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18187980 is an abundant number, since it is smaller than the sum of its proper divisors (32996244).

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

18187980 is a wasteful number, since it uses less digits than its factorization.

18187980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546 (or 1544 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 42.

The square root of 18187980 is about 4264.7368031333. The cubic root of 18187980 is about 262.9832910684.

The spelling of 18187980 in words is "eighteen million, one hundred eighty-seven thousand, nine hundred eighty".