18864231 has 4 divisors (see below), whose sum is σ = 25152312. Its totient is φ = 12576152.

The previous prime is 18864221. The next prime is 18864253. The reversal of 18864231 is 13246881.

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 18864231 - 2⁷ = 18864103 is a prime.

It is a super-2 number, since 2×18864231² = 711718422442722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18864192 and 18864201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18864211) 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, 3144036 + ... + 3144041.

It is an arithmetic number, because the mean of its divisors is an integer number (6288078).

Almost surely, 2^18864231 is an apocalyptic number.

18864231 is a deficient number, since it is larger than the sum of its proper divisors (6288081).

18864231 is an equidigital number, since it uses as much as digits as its factorization.

18864231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6288080.

The product of its digits is 9216, while the sum is 33.

The square root of 18864231 is about 4343.2972497862. The cubic root of 18864231 is about 266.2030550484.

The spelling of 18864231 in words is "eighteen million, eight hundred sixty-four thousand, two hundred thirty-one".