18642469 has 2 divisors, whose sum is σ = 18642470. Its totient is φ = 18642468.

The previous prime is 18642467. The next prime is 18642493. The reversal of 18642469 is 96424681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15880225 + 2762244 = 3985^2 + 1662^2 .

It is a cyclic number.

It is not a de Polignac number, because 18642469 - 2¹ = 18642467 is a prime.

It is a super-3 number, since 3×18642469³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 18642467, 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 (18642467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9321234 + 9321235.

It is an arithmetic number, because the mean of its divisors is an integer number (9321235).

Almost surely, 2^18642469 is an apocalyptic number.

It is an amenable number.

18642469 is a deficient number, since it is larger than the sum of its proper divisors (1).

18642469 is an equidigital number, since it uses as much as digits as its factorization.

18642469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The square root of 18642469 is about 4317.6925550576. The cubic root of 18642469 is about 265.1558072713.

The spelling of 18642469 in words is "eighteen million, six hundred forty-two thousand, four hundred sixty-nine".