18634897 has 2 divisors, whose sum is σ = 18634898. Its totient is φ = 18634896.

The previous prime is 18634883. The next prime is 18634901. The reversal of 18634897 is 79843681.

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., 18584721 + 50176 = 4311^2 + 224^2 .

It is a cyclic number.

It is not a de Polignac number, because 18634897 - 2⁷ = 18634769 is a prime.

It is not a weakly prime, because it can be changed into another prime (18634817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9317448 + 9317449.

It is an arithmetic number, because the mean of its divisors is an integer number (9317449).

Almost surely, 2^18634897 is an apocalyptic number.

It is an amenable number.

18634897 is a deficient number, since it is larger than the sum of its proper divisors (1).

18634897 is an equidigital number, since it uses as much as digits as its factorization.

18634897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 46.

The square root of 18634897 is about 4316.8156087561. The cubic root of 18634897 is about 265.1199030202.

The spelling of 18634897 in words is "eighteen million, six hundred thirty-four thousand, eight hundred ninety-seven".