18322993 has 8 divisors (see below), whose sum is σ = 19855808. Its totient is φ = 16807824.

The previous prime is 18322987. The next prime is 18323003. The reversal of 18322993 is 39922381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18322993 - 2⁵ = 18322961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18322933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2205 + ... + 6442.

It is an arithmetic number, because the mean of its divisors is an integer number (2481976).

Almost surely, 2^18322993 is an apocalyptic number.

18322993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18322993 is a deficient number, since it is larger than the sum of its proper divisors (1532815).

18322993 is a wasteful number, since it uses less digits than its factorization.

18322993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8823.

The product of its digits is 23328, while the sum is 37.

The square root of 18322993 is about 4280.5365317913. The cubic root of 18322993 is about 263.6324133123.

The spelling of 18322993 in words is "eighteen million, three hundred twenty-two thousand, nine hundred ninety-three".