18914231 has 4 divisors (see below), whose sum is σ = 21616272. Its totient is φ = 16212192.

The previous prime is 18914213. The next prime is 18914239. The reversal of 18914231 is 13241981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13241981 = 73 ⋅181397.

It is a cyclic number.

It is not a de Polignac number, because 18914231 - 2¹⁰ = 18913207 is a prime.

It is a super-2 number, since 2×18914231² = 715496268642722, 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 = 18914194 and 18914203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18914239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1351010 + ... + 1351023.

It is an arithmetic number, because the mean of its divisors is an integer number (5404068).

Almost surely, 2^18914231 is an apocalyptic number.

18914231 is a deficient number, since it is larger than the sum of its proper divisors (2702041).

18914231 is an equidigital number, since it uses as much as digits as its factorization.

18914231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2702040.

The product of its digits is 1728, while the sum is 29.

The square root of 18914231 is about 4349.0494363711. The cubic root of 18914231 is about 266.4380396326.

The spelling of 18914231 in words is "eighteen million, nine hundred fourteen thousand, two hundred thirty-one".