18985297 has 2 divisors, whose sum is σ = 18985298. Its totient is φ = 18985296.

The previous prime is 18985283. The next prime is 18985301. The reversal of 18985297 is 79258981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13220496 + 5764801 = 3636^2 + 2401^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18985297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18985297.

It is not a weakly prime, because it can be changed into another prime (18985207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9492648 + 9492649.

It is an arithmetic number, because the mean of its divisors is an integer number (9492649).

Almost surely, 2^18985297 is an apocalyptic number.

It is an amenable number.

18985297 is a deficient number, since it is larger than the sum of its proper divisors (1).

18985297 is an equidigital number, since it uses as much as digits as its factorization.

18985297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 49.

The square root of 18985297 is about 4357.2120673660. The cubic root of 18985297 is about 266.7713163915.

The spelling of 18985297 in words is "eighteen million, nine hundred eighty-five thousand, two hundred ninety-seven".