18127993 has 8 divisors (see below), whose sum is σ = 19611648. Its totient is φ = 16657104.

The previous prime is 18127981. The next prime is 18127997. The reversal of 18127993 is 39972181.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18127993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18127997) 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, 121 + ... + 6022.

It is an arithmetic number, because the mean of its divisors is an integer number (2451456).

Almost surely, 2^18127993 is an apocalyptic number.

18127993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18127993 is a deficient number, since it is larger than the sum of its proper divisors (1483655).

18127993 is a wasteful number, since it uses less digits than its factorization.

18127993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6383.

The product of its digits is 27216, while the sum is 40.

The square root of 18127993 is about 4257.6980869949. The cubic root of 18127993 is about 262.6938516689.

The spelling of 18127993 in words is "eighteen million, one hundred twenty-seven thousand, nine hundred ninety-three".