18383493 has 4 divisors (see below), whose sum is σ = 24511328. Its totient is φ = 12255660.

The previous prime is 18383483. The next prime is 18383501. The reversal of 18383493 is 39438381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18383493 - 2²⁴ = 1606277 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 (18383423) 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, 3063913 + ... + 3063918.

It is an arithmetic number, because the mean of its divisors is an integer number (6127832).

Almost surely, 2^18383493 is an apocalyptic number.

It is an amenable number.

18383493 is a deficient number, since it is larger than the sum of its proper divisors (6127835).

18383493 is an equidigital number, since it uses as much as digits as its factorization.

18383493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6127834.

The product of its digits is 62208, while the sum is 39.

The square root of 18383493 is about 4287.5975790645. The cubic root of 18383493 is about 263.9222538513.

The spelling of 18383493 in words is "eighteen million, three hundred eighty-three thousand, four hundred ninety-three".