18855047 has 2 divisors, whose sum is σ = 18855048. Its totient is φ = 18855046.

The previous prime is 18855041. The next prime is 18855061. The reversal of 18855047 is 74055881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18855047 - 2²⁰ = 17806471 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18855047.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18855041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9427523 + 9427524.

It is an arithmetic number, because the mean of its divisors is an integer number (9427524).

Almost surely, 2^18855047 is an apocalyptic number.

18855047 is a deficient number, since it is larger than the sum of its proper divisors (1).

18855047 is an equidigital number, since it uses as much as digits as its factorization.

18855047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44800, while the sum is 38.

The square root of 18855047 is about 4342.2398597959. The cubic root of 18855047 is about 266.1598479560.

The spelling of 18855047 in words is "eighteen million, eight hundred fifty-five thousand, forty-seven".