18372493 has 4 divisors (see below), whose sum is σ = 18386748. Its totient is φ = 18358240.

The previous prime is 18372463. The next prime is 18372511. The reversal of 18372493 is 39427381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7469289 + 10903204 = 2733^2 + 3302^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18372493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18372433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4978 + ... + 7843.

It is an arithmetic number, because the mean of its divisors is an integer number (4596687).

Almost surely, 2^18372493 is an apocalyptic number.

It is an amenable number.

18372493 is a deficient number, since it is larger than the sum of its proper divisors (14255).

18372493 is a wasteful number, since it uses less digits than its factorization.

18372493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14254.

The product of its digits is 36288, while the sum is 37.

The square root of 18372493 is about 4286.3146174773. The cubic root of 18372493 is about 263.8696029209.

The spelling of 18372493 in words is "eighteen million, three hundred seventy-two thousand, four hundred ninety-three".