18984490 has 32 divisors (see below), whose sum is σ = 39559680. Its totient is φ = 6424704.

The previous prime is 18984479. The next prime is 18984521. The reversal of 18984490 is 9448981.

18984490 = 70² + 71² + ... + 385².

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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, 3814 + ... + 7246.

It is an arithmetic number, because the mean of its divisors is an integer number (1236240).

Almost surely, 2^18984490 is an apocalyptic number.

18984490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18984490 is an abundant number, since it is smaller than the sum of its proper divisors (20575190).

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

18984490 is a wasteful number, since it uses less digits than its factorization.

18984490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3526.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 18984490 is about 4357.1194612955. The cubic root of 18984490 is about 266.7675364928.

The spelling of 18984490 in words is "eighteen million, nine hundred eighty-four thousand, four hundred ninety".