18604897 has 2 divisors, whose sum is σ = 18604898. Its totient is φ = 18604896.

The previous prime is 18604889. The next prime is 18604909. The reversal of 18604897 is 79840681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15649936 + 2954961 = 3956^2 + 1719^2 .

It is an emirp because it is prime and its reverse (79840681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18604897 - 2³ = 18604889 is a prime.

It is a super-2 number, since 2×18604897² = 692284384761218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18604837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9302448 + 9302449.

It is an arithmetic number, because the mean of its divisors is an integer number (9302449).

Almost surely, 2^18604897 is an apocalyptic number.

It is an amenable number.

18604897 is a deficient number, since it is larger than the sum of its proper divisors (1).

18604897 is an equidigital number, since it uses as much as digits as its factorization.

18604897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 18604897 is about 4313.3394255495. The cubic root of 18604897 is about 264.9775559489.

It can be divided in two parts, 1860489 and 7, that added together give a square (1860496 = 1364²).

The spelling of 18604897 in words is "eighteen million, six hundred four thousand, eight hundred ninety-seven".