18705983 has 2 divisors, whose sum is σ = 18705984. Its totient is φ = 18705982.

The previous prime is 18705977. The next prime is 18706003. The reversal of 18705983 is 38950781.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18705983 - 2¹⁸ = 18443839 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 18705983.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18705283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9352991 + 9352992.

It is an arithmetic number, because the mean of its divisors is an integer number (9352992).

Almost surely, 2^18705983 is an apocalyptic number.

18705983 is a deficient number, since it is larger than the sum of its proper divisors (1).

18705983 is an equidigital number, since it uses as much as digits as its factorization.

18705983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 18705983 is about 4325.0413870852. The cubic root of 18705983 is about 265.4565903282.

The spelling of 18705983 in words is "eighteen million, seven hundred five thousand, nine hundred eighty-three".