18858971 has 2 divisors, whose sum is σ = 18858972. Its totient is φ = 18858970.

The previous prime is 18858947. The next prime is 18859013. The reversal of 18858971 is 17985881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18858971 - 2⁶ = 18858907 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18858901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9429485 + 9429486.

It is an arithmetic number, because the mean of its divisors is an integer number (9429486).

Almost surely, 2^18858971 is an apocalyptic number.

18858971 is a deficient number, since it is larger than the sum of its proper divisors (1).

18858971 is an equidigital number, since it uses as much as digits as its factorization.

18858971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 47.

The square root of 18858971 is about 4342.6916768290. The cubic root of 18858971 is about 266.1783105423.

The spelling of 18858971 in words is "eighteen million, eight hundred fifty-eight thousand, nine hundred seventy-one".