18866231 has 8 divisors (see below), whose sum is σ = 19161600. Its totient is φ = 18573408.

The previous prime is 18866213. The next prime is 18866291. The reversal of 18866231 is 13266881.

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

It is a cyclic number.

It is not a de Polignac number, because 18866231 - 2¹⁸ = 18604087 is a prime.

It is a super-2 number, since 2×18866231² = 711869344290722, 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 = 18866191 and 18866200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18866291) 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, 18425 + ... + 19421.

It is an arithmetic number, because the mean of its divisors is an integer number (2395200).

Almost surely, 2^18866231 is an apocalyptic number.

18866231 is a deficient number, since it is larger than the sum of its proper divisors (295369).

18866231 is a wasteful number, since it uses less digits than its factorization.

18866231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273.

The product of its digits is 13824, while the sum is 35.

The square root of 18866231 is about 4343.5274835092. The cubic root of 18866231 is about 266.2124623988.

The spelling of 18866231 in words is "eighteen million, eight hundred sixty-six thousand, two hundred thirty-one".