18673693 has 2 divisors, whose sum is σ = 18673694. Its totient is φ = 18673692.

The previous prime is 18673679. The next prime is 18673703. The reversal of 18673693 is 39637681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13089924 + 5583769 = 3618^2 + 2363^2 .

It is a cyclic number.

It is not a de Polignac number, because 18673693 - 2⁵ = 18673661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18673643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9336846 + 9336847.

It is an arithmetic number, because the mean of its divisors is an integer number (9336847).

Almost surely, 2^18673693 is an apocalyptic number.

It is an amenable number.

18673693 is a deficient number, since it is larger than the sum of its proper divisors (1).

18673693 is an equidigital number, since it uses as much as digits as its factorization.

18673693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 43.

The square root of 18673693 is about 4321.3068625128. The cubic root of 18673693 is about 265.3037599016.

The spelling of 18673693 in words is "eighteen million, six hundred seventy-three thousand, six hundred ninety-three".