18075993 has 16 divisors (see below), whose sum is σ = 26066880. Its totient is φ = 11075904.

The previous prime is 18075991. The next prime is 18076001. The reversal of 18075993 is 39957081.

It is a happy number.

It is not a de Polignac number, because 18075993 - 2¹ = 18075991 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18075991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9630 + ... + 11352.

It is an arithmetic number, because the mean of its divisors is an integer number (1629180).

Almost surely, 2^18075993 is an apocalyptic number.

18075993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18075993 is a deficient number, since it is larger than the sum of its proper divisors (7990887).

18075993 is a wasteful number, since it uses less digits than its factorization.

18075993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2008.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 18075993 is about 4251.5871154194. The cubic root of 18075993 is about 262.4424327277.

The spelling of 18075993 in words is "eighteen million, seventy-five thousand, nine hundred ninety-three".