18947099 has 2 divisors, whose sum is σ = 18947100. Its totient is φ = 18947098.

The previous prime is 18947087. The next prime is 18947113. The reversal of 18947099 is 99074981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18947099 - 2⁸ = 18946843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18947029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9473549 + 9473550.

It is an arithmetic number, because the mean of its divisors is an integer number (9473550).

Almost surely, 2^18947099 is an apocalyptic number.

18947099 is a deficient number, since it is larger than the sum of its proper divisors (1).

18947099 is an equidigital number, since it uses as much as digits as its factorization.

18947099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 18947099 is about 4352.8265529424. The cubic root of 18947099 is about 266.5922835941.

The spelling of 18947099 in words is "eighteen million, nine hundred forty-seven thousand, ninety-nine".