18109490 has 16 divisors (see below), whose sum is σ = 37253952. Its totient is φ = 6208944.

The previous prime is 18109457. The next prime is 18109499. The reversal of 18109490 is 9490181.

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 (18109499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129284 + ... + 129423.

It is an arithmetic number, because the mean of its divisors is an integer number (2328372).

Almost surely, 2^18109490 is an apocalyptic number.

18109490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18109490 is an abundant number, since it is smaller than the sum of its proper divisors (19144462).

18109490 is a wasteful number, since it uses less digits than its factorization.

18109490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258721.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 18109490 is about 4255.5246445062. The cubic root of 18109490 is about 262.6044452096.

The spelling of 18109490 in words is "eighteen million, one hundred nine thousand, four hundred ninety".