18542980 has 12 divisors (see below), whose sum is σ = 38940300. Its totient is φ = 7417184.

The previous prime is 18542969. The next prime is 18542981. The reversal of 18542980 is 8924581.

It can be written as a sum of positive squares in 2 ways, for example, as 12152196 + 6390784 = 3486^2 + 2528^2 .

It is not an unprimeable number, because it can be changed into a prime (18542981) 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 3 ways as a sum of consecutive naturals, for example, 463555 + ... + 463594.

It is an arithmetic number, because the mean of its divisors is an integer number (3245025).

Almost surely, 2^18542980 is an apocalyptic number.

18542980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18542980 is an abundant number, since it is smaller than the sum of its proper divisors (20397320).

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

18542980 is a wasteful number, since it uses less digits than its factorization.

18542980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927158 (or 927156 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 18542980 is about 4306.1560584819. The cubic root of 18542980 is about 264.6832812851.

The spelling of 18542980 in words is "eighteen million, five hundred forty-two thousand, nine hundred eighty".