18869231 has 4 divisors (see below), whose sum is σ = 19270752. Its totient is φ = 18467712.

The previous prime is 18869209. The next prime is 18869237. The reversal of 18869231 is 13296881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13296881 = 13 ⋅1022837.

It is a cyclic number.

It is not a de Polignac number, because 18869231 - 2¹⁰ = 18868207 is a prime.

It is a super-2 number, since 2×18869231² = 712095757062722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18869237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200690 + ... + 200783.

It is an arithmetic number, because the mean of its divisors is an integer number (4817688).

Almost surely, 2^18869231 is an apocalyptic number.

18869231 is a deficient number, since it is larger than the sum of its proper divisors (401521).

18869231 is an equidigital number, since it uses as much as digits as its factorization.

18869231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401520.

The product of its digits is 20736, while the sum is 38.

The square root of 18869231 is about 4343.8728112135. The cubic root of 18869231 is about 266.2265721780.

The spelling of 18869231 in words is "eighteen million, eight hundred sixty-nine thousand, two hundred thirty-one".