18719490 has 16 divisors (see below), whose sum is σ = 44926848. Its totient is φ = 4991856.

The previous prime is 18719483. The next prime is 18719509. The reversal of 18719490 is 9491781.

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, 311962 + ... + 312021.

It is an arithmetic number, because the mean of its divisors is an integer number (2807928).

Almost surely, 2^18719490 is an apocalyptic number.

18719490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18719490 is an abundant number, since it is smaller than the sum of its proper divisors (26207358).

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

18719490 is a wasteful number, since it uses less digits than its factorization.

18719490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623993.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 18719490 is about 4326.6025932595. The cubic root of 18719490 is about 265.5204675650.

The spelling of 18719490 in words is "eighteen million, seven hundred nineteen thousand, four hundred ninety".