18031390090 has 16 divisors (see below), whose sum is σ = 37093145472. Its totient is φ = 6182190864.

The previous prime is 18031390087. The next prime is 18031390129. The reversal of 18031390090 is 9009313081.

It is a super-3 number, since 3×18031390090³ (a number of 32 digits) contains 333 as substring.

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, 128795574 + ... + 128795713.

It is an arithmetic number, because the mean of its divisors is an integer number (2318321592).

Almost surely, 2^18031390090 is an apocalyptic number.

18031390090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18031390090 is an abundant number, since it is smaller than the sum of its proper divisors (19061755382).

18031390090 is a wasteful number, since it uses less digits than its factorization.

18031390090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257591301.

The product of its (nonzero) digits is 5832, while the sum is 34.

The spelling of 18031390090 in words is "eighteen billion, thirty-one million, three hundred ninety thousand, ninety".