18323513 has 8 divisors (see below), whose sum is σ = 19790400. Its totient is φ = 16864848.

The previous prime is 18323489. The next prime is 18323519. The reversal of 18323513 is 31532381.

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

It is not a de Polignac number, because 18323513 - 2⁸ = 18323257 is a prime.

It is a super-2 number, since 2×18323513² = 671502257322338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18323519) 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, 3068 + ... + 6786.

It is an arithmetic number, because the mean of its divisors is an integer number (2473800).

Almost surely, 2^18323513 is an apocalyptic number.

18323513 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18323513 is a deficient number, since it is larger than the sum of its proper divisors (1466887).

18323513 is a wasteful number, since it uses less digits than its factorization.

18323513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4111.

The product of its digits is 2160, while the sum is 26.

The square root of 18323513 is about 4280.5972714097. The cubic root of 18323513 is about 263.6349072200.

Adding to 18323513 its reverse (31532381), we get a palindrome (49855894).

The spelling of 18323513 in words is "eighteen million, three hundred twenty-three thousand, five hundred thirteen".