18897469 has 2 divisors, whose sum is σ = 18897470. Its totient is φ = 18897468.

The previous prime is 18897449. The next prime is 18897479. The reversal of 18897469 is 96479881.

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., 18705625 + 191844 = 4325^2 + 438^2 .

It is an emirp because it is prime and its reverse (96479881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18897469 - 2⁷ = 18897341 is a prime.

It is a super-2 number, since 2×18897469² = 714228669211922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18897449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9448734 + 9448735.

It is an arithmetic number, because the mean of its divisors is an integer number (9448735).

Almost surely, 2^18897469 is an apocalyptic number.

It is an amenable number.

18897469 is a deficient number, since it is larger than the sum of its proper divisors (1).

18897469 is an equidigital number, since it uses as much as digits as its factorization.

18897469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 52.

The square root of 18897469 is about 4347.1219214556. The cubic root of 18897469 is about 266.3593095950.

The spelling of 18897469 in words is "eighteen million, eight hundred ninety-seven thousand, four hundred sixty-nine".