18268231 has 4 divisors (see below), whose sum is σ = 18898200. Its totient is φ = 17638264.

The previous prime is 18268223. The next prime is 18268241. The reversal of 18268231 is 13286281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13286281 = 1613 ⋅8237.

It is not a de Polignac number, because 18268231 - 2³ = 18268223 is a prime.

It is a super-2 number, since 2×18268231² = 667456527738722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18268193 and 18268202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18268241) 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, 314941 + ... + 314998.

It is an arithmetic number, because the mean of its divisors is an integer number (4724550).

Almost surely, 2^18268231 is an apocalyptic number.

18268231 is a deficient number, since it is larger than the sum of its proper divisors (629969).

18268231 is an equidigital number, since it uses as much as digits as its factorization.

18268231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629968.

The product of its digits is 4608, while the sum is 31.

The square root of 18268231 is about 4274.1351171904. The cubic root of 18268231 is about 263.3695114887.

The spelling of 18268231 in words is "eighteen million, two hundred sixty-eight thousand, two hundred thirty-one".