18162993 has 24 divisors (see below), whose sum is σ = 26432256. Its totient is φ = 11080800.

The previous prime is 18162979. The next prime is 18163001. The reversal of 18162993 is 39926181.

It is not a de Polignac number, because 18162993 - 2²⁴ = 1385777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18162913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33303 + ... + 33843.

It is an arithmetic number, because the mean of its divisors is an integer number (1101344).

Almost surely, 2^18162993 is an apocalyptic number.

It is an amenable number.

18162993 is a deficient number, since it is larger than the sum of its proper divisors (8269263).

18162993 is a wasteful number, since it uses less digits than its factorization.

18162993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613 (or 594 counting only the distinct ones).

The product of its digits is 23328, while the sum is 39.

The square root of 18162993 is about 4261.8063071895. The cubic root of 18162993 is about 262.8628053595.

The spelling of 18162993 in words is "eighteen million, one hundred sixty-two thousand, nine hundred ninety-three".