18323387 has 12 divisors (see below), whose sum is σ = 19780560. Its totient is φ = 16940880.

The previous prime is 18323381. The next prime is 18323419. The reversal of 18323387 is 78332381.

It is not a de Polignac number, because 18323387 - 2⁸ = 18323131 is a prime.

It is a super-2 number, since 2×18323387² = 671493022303538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18323381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21689 + ... + 22517.

It is an arithmetic number, because the mean of its divisors is an integer number (1648380).

Almost surely, 2^18323387 is an apocalyptic number.

18323387 is a deficient number, since it is larger than the sum of its proper divisors (1457173).

18323387 is an equidigital number, since it uses as much as digits as its factorization.

18323387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914 (or 883 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 18323387 is about 4280.5825538120. The cubic root of 18323387 is about 263.6343029313.

The spelling of 18323387 in words is "eighteen million, three hundred twenty-three thousand, three hundred eighty-seven".