18712943 has 2 divisors, whose sum is σ = 18712944. Its totient is φ = 18712942.

The previous prime is 18712921. The next prime is 18713027. The reversal of 18712943 is 34921781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18712943 - 2⁶ = 18712879 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 (18718943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9356471 + 9356472.

It is an arithmetic number, because the mean of its divisors is an integer number (9356472).

Almost surely, 2^18712943 is an apocalyptic number.

18712943 is a deficient number, since it is larger than the sum of its proper divisors (1).

18712943 is an equidigital number, since it uses as much as digits as its factorization.

18712943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 18712943 is about 4325.8459288329. The cubic root of 18712943 is about 265.4895093640.

The spelling of 18712943 in words is "eighteen million, seven hundred twelve thousand, nine hundred forty-three".