18450689 has 2 divisors, whose sum is σ = 18450690. Its totient is φ = 18450688.

The previous prime is 18450671. The next prime is 18450701. The reversal of 18450689 is 98605481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16875664 + 1575025 = 4108^2 + 1255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18450689 is a prime.

It is not a weakly prime, because it can be changed into another prime (18450629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9225344 + 9225345.

It is an arithmetic number, because the mean of its divisors is an integer number (9225345).

Almost surely, 2^18450689 is an apocalyptic number.

It is an amenable number.

18450689 is a deficient number, since it is larger than the sum of its proper divisors (1).

18450689 is an equidigital number, since it uses as much as digits as its factorization.

18450689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 18450689 is about 4295.4265213131. The cubic root of 18450689 is about 264.2434288603.

The spelling of 18450689 in words is "eighteen million, four hundred fifty thousand, six hundred eighty-nine".