18515982 has 16 divisors (see below), whose sum is σ = 37089360. Its totient is φ = 6162432.

The previous prime is 18515971. The next prime is 18515983. The reversal of 18515982 is 28951581.

It is a self number, because there is not a number n which added to its sum of digits gives 18515982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18515983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2608 + ... + 6620.

It is an arithmetic number, because the mean of its divisors is an integer number (2318085).

Almost surely, 2^18515982 is an apocalyptic number.

18515982 is an abundant number, since it is smaller than the sum of its proper divisors (18573378).

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

18515982 is a wasteful number, since it uses less digits than its factorization.

18515982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4787.

The product of its digits is 28800, while the sum is 39.

The square root of 18515982 is about 4303.0201022073. The cubic root of 18515982 is about 264.5547620267.

The spelling of 18515982 in words is "eighteen million, five hundred fifteen thousand, nine hundred eighty-two".