18009469 has 2 divisors, whose sum is σ = 18009470. Its totient is φ = 18009468.

The previous prime is 18009463. The next prime is 18009479. The reversal of 18009469 is 96490081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17749369 + 260100 = 4213^2 + 510^2 .

It is a cyclic number.

It is not a de Polignac number, because 18009469 - 2³ = 18009461 is a prime.

It is a super-2 number, since 2×18009469² = 648681947323922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18009461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9004734 + 9004735.

It is an arithmetic number, because the mean of its divisors is an integer number (9004735).

Almost surely, 2^18009469 is an apocalyptic number.

It is an amenable number.

18009469 is a deficient number, since it is larger than the sum of its proper divisors (1).

18009469 is an equidigital number, since it uses as much as digits as its factorization.

18009469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 18009469 is about 4243.7564727491. The cubic root of 18009469 is about 262.1200865506.

The spelling of 18009469 in words is "eighteen million, nine thousand, four hundred sixty-nine".