18621490 has 16 divisors (see below), whose sum is σ = 34976448. Its totient is φ = 7124656.

The previous prime is 18621487. The next prime is 18621523. The reversal of 18621490 is 9412681.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40252 + ... + 40711.

It is an arithmetic number, because the mean of its divisors is an integer number (2186028).

Almost surely, 2^18621490 is an apocalyptic number.

18621490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18621490 is a deficient number, since it is larger than the sum of its proper divisors (16354958).

18621490 is a wasteful number, since it uses less digits than its factorization.

18621490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80993.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 18621490 is about 4315.2624485656. The cubic root of 18621490 is about 265.0563070098.

The spelling of 18621490 in words is "eighteen million, six hundred twenty-one thousand, four hundred ninety".