18693427 has 2 divisors, whose sum is σ = 18693428. Its totient is φ = 18693426.

The previous prime is 18693413. The next prime is 18693439. The reversal of 18693427 is 72439681.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18693427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18693427.

It is not a weakly prime, because it can be changed into another prime (18693497) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9346713 + 9346714.

It is an arithmetic number, because the mean of its divisors is an integer number (9346714).

Almost surely, 2^18693427 is an apocalyptic number.

18693427 is a deficient number, since it is larger than the sum of its proper divisors (1).

18693427 is an equidigital number, since it uses as much as digits as its factorization.

18693427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 18693427 is about 4323.5895966199. The cubic root of 18693427 is about 265.3971829722.

The spelling of 18693427 in words is "eighteen million, six hundred ninety-three thousand, four hundred twenty-seven".