18894671 has 2 divisors, whose sum is σ = 18894672. Its totient is φ = 18894670.

The previous prime is 18894649. The next prime is 18894677. The reversal of 18894671 is 17649881.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18894671 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18894677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9447335 + 9447336.

It is an arithmetic number, because the mean of its divisors is an integer number (9447336).

Almost surely, 2^18894671 is an apocalyptic number.

18894671 is a deficient number, since it is larger than the sum of its proper divisors (1).

18894671 is an equidigital number, since it uses as much as digits as its factorization.

18894671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 44.

The square root of 18894671 is about 4346.8000874206. The cubic root of 18894671 is about 266.3461630349.

The spelling of 18894671 in words is "eighteen million, eight hundred ninety-four thousand, six hundred seventy-one".