18985711 has 2 divisors, whose sum is σ = 18985712. Its totient is φ = 18985710.

The previous prime is 18985709. The next prime is 18985717. The reversal of 18985711 is 11758981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18985711 - 2¹ = 18985709 is a prime.

Together with 18985709, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18985717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9492855 + 9492856.

It is an arithmetic number, because the mean of its divisors is an integer number (9492856).

Almost surely, 2^18985711 is an apocalyptic number.

18985711 is a deficient number, since it is larger than the sum of its proper divisors (1).

18985711 is an equidigital number, since it uses as much as digits as its factorization.

18985711 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 40.

The square root of 18985711 is about 4357.2595745491. The cubic root of 18985711 is about 266.7732554802.

The spelling of 18985711 in words is "eighteen million, nine hundred eighty-five thousand, seven hundred eleven".