18085431 has 32 divisors (see below), whose sum is σ = 30650368. Its totient is φ = 9227520.

The previous prime is 18085411. The next prime is 18085439. The reversal of 18085431 is 13458081.

It is not a de Polignac number, because 18085431 - 2⁹ = 18084919 is a prime.

It is a super-2 number, since 2×18085431² = 654165628911522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18085439) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7395 + ... + 9531.

It is an arithmetic number, because the mean of its divisors is an integer number (957824).

Almost surely, 2^18085431 is an apocalyptic number.

18085431 is a deficient number, since it is larger than the sum of its proper divisors (12564937).

18085431 is a wasteful number, since it uses less digits than its factorization.

18085431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 18085431 is about 4252.6969090214. The cubic root of 18085431 is about 262.4881010479.

The spelling of 18085431 in words is "eighteen million, eighty-five thousand, four hundred thirty-one".