18360997 has 2 divisors, whose sum is σ = 18360998. Its totient is φ = 18360996.

The previous prime is 18360971. The next prime is 18361051. The reversal of 18360997 is 79906381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17969121 + 391876 = 4239^2 + 626^2 .

It is a cyclic number.

It is not a de Polignac number, because 18360997 - 2⁷ = 18360869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18360197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9180498 + 9180499.

It is an arithmetic number, because the mean of its divisors is an integer number (9180499).

Almost surely, 2^18360997 is an apocalyptic number.

It is an amenable number.

18360997 is a deficient number, since it is larger than the sum of its proper divisors (1).

18360997 is an equidigital number, since it uses as much as digits as its factorization.

18360997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 18360997 is about 4284.9733954833. The cubic root of 18360997 is about 263.8145554491.

It can be divided in two parts, 18 and 360997, that multiplied together give a palindrome (6497946).

The spelling of 18360997 in words is "eighteen million, three hundred sixty thousand, nine hundred ninety-seven".