18008693 has 2 divisors, whose sum is σ = 18008694. Its totient is φ = 18008692.

The previous prime is 18008689. The next prime is 18008777. The reversal of 18008693 is 39680081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10484644 + 7524049 = 3238^2 + 2743^2 .

It is a cyclic number.

It is not a de Polignac number, because 18008693 - 2² = 18008689 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18008633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9004346 + 9004347.

It is an arithmetic number, because the mean of its divisors is an integer number (9004347).

Almost surely, 2^18008693 is an apocalyptic number.

It is an amenable number.

18008693 is a deficient number, since it is larger than the sum of its proper divisors (1).

18008693 is an equidigital number, since it uses as much as digits as its factorization.

18008693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 18008693 is about 4243.6650433322. The cubic root of 18008693 is about 262.1163217143.

The spelling of 18008693 in words is "eighteen million, eight thousand, six hundred ninety-three".