18215980 has 12 divisors (see below), whose sum is σ = 38253600. Its totient is φ = 7286384.

The previous prime is 18215963. The next prime is 18215983. The reversal of 18215980 is 8951281.

It is a super-3 number, since 3×18215980³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18215983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455380 + ... + 455419.

It is an arithmetic number, because the mean of its divisors is an integer number (3187800).

Almost surely, 2^18215980 is an apocalyptic number.

18215980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18215980 is an abundant number, since it is smaller than the sum of its proper divisors (20037620).

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

18215980 is a wasteful number, since it uses less digits than its factorization.

18215980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910808 (or 910806 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 18215980 is about 4268.0182754998. The cubic root of 18215980 is about 263.1181742295.

The spelling of 18215980 in words is "eighteen million, two hundred fifteen thousand, nine hundred eighty".