18040090 has 16 divisors (see below), whose sum is σ = 33350472. Its totient is φ = 7020864.

The previous prime is 18040081. The next prime is 18040129. The reversal of 18040090 is 9004081.

It can be written as a sum of positive squares in 4 ways, for example, as 15139881 + 2900209 = 3891^2 + 1703^2 .

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, 24009 + ... + 24748.

Almost surely, 2^18040090 is an apocalyptic number.

18040090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18040090 is a deficient number, since it is larger than the sum of its proper divisors (15310382).

18040090 is a wasteful number, since it uses less digits than its factorization.

18040090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48801.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 18040090 is about 4247.3627111421. The cubic root of 18040090 is about 262.2685609347.

The spelling of 18040090 in words is "eighteen million, forty thousand, ninety".