18545490 has 32 divisors (see below), whose sum is σ = 49455360. Its totient is φ = 4945392.

The previous prime is 18545479. The next prime is 18545497. The reversal of 18545490 is 9454581.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18545497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34074 + ... + 34613.

It is an arithmetic number, because the mean of its divisors is an integer number (1545480).

Almost surely, 2^18545490 is an apocalyptic number.

18545490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18545490 is an abundant number, since it is smaller than the sum of its proper divisors (30909870).

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

18545490 is a wasteful number, since it uses less digits than its factorization.

18545490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68703 (or 68697 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 18545490 is about 4306.4474918429. The cubic root of 18545490 is about 264.6952233616.

Subtracting from 18545490 its reverse (9454581), we obtain a palindrome (9090909).

The spelling of 18545490 in words is "eighteen million, five hundred forty-five thousand, four hundred ninety".