18868469 has 2 divisors, whose sum is σ = 18868470. Its totient is φ = 18868468.

The previous prime is 18868433. The next prime is 18868471. The reversal of 18868469 is 96486881.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16728100 + 2140369 = 4090^2 + 1463^2 .

It is an emirp because it is prime and its reverse (96486881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18868469 is a prime.

It is a super-2 number, since 2×18868469² = 712038244807922, which contains 22 as substring.

Together with 18868471, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18868489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9434234 + 9434235.

It is an arithmetic number, because the mean of its divisors is an integer number (9434235).

Almost surely, 2^18868469 is an apocalyptic number.

It is an amenable number.

18868469 is a deficient number, since it is larger than the sum of its proper divisors (1).

18868469 is an equidigital number, since it uses as much as digits as its factorization.

18868469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 663552, while the sum is 50.

The square root of 18868469 is about 4343.7851005776. The cubic root of 18868469 is about 266.2229884358. Note that the first 3 decimals are identical.

The spelling of 18868469 in words is "eighteen million, eight hundred sixty-eight thousand, four hundred sixty-nine".