18305090 has 64 divisors (see below), whose sum is σ = 37324800. Its totient is φ = 6429696.

The previous prime is 18305071. The next prime is 18305117. The reversal of 18305090 is 9050381.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231671 + ... + 231749.

It is an arithmetic number, because the mean of its divisors is an integer number (583200).

Almost surely, 2^18305090 is an apocalyptic number.

18305090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18305090 is an abundant number, since it is smaller than the sum of its proper divisors (19019710).

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

18305090 is a wasteful number, since it uses less digits than its factorization.

18305090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 18305090 is about 4278.4448109097. Note that the first 3 decimals coincide. The cubic root of 18305090 is about 263.5465221565.

The spelling of 18305090 in words is "eighteen million, three hundred five thousand, ninety".