18312299 has 4 divisors (see below), whose sum is σ = 18807264. Its totient is φ = 17817336.

The previous prime is 18312263. The next prime is 18312319. The reversal of 18312299 is 99221381.

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

It is a cyclic number.

It is not a de Polignac number, because 18312299 - 2¹² = 18308203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18312499) 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, 247427 + ... + 247500.

It is an arithmetic number, because the mean of its divisors is an integer number (4701816).

Almost surely, 2^18312299 is an apocalyptic number.

18312299 is a deficient number, since it is larger than the sum of its proper divisors (494965).

18312299 is an equidigital number, since it uses as much as digits as its factorization.

18312299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494964.

The product of its digits is 7776, while the sum is 35.

The square root of 18312299 is about 4279.2872070007. The cubic root of 18312299 is about 263.5811146756.

The spelling of 18312299 in words is "eighteen million, three hundred twelve thousand, two hundred ninety-nine".