18986129 has 2 divisors, whose sum is σ = 18986130. Its totient is φ = 18986128.

The previous prime is 18986117. The next prime is 18986131. The reversal of 18986129 is 92168981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18939904 + 46225 = 4352^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 18986129 - 2⁴ = 18986113 is a prime.

Together with 18986131, it forms a pair of twin primes.

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 18986129.

It is not a weakly prime, because it can be changed into another prime (18986029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9493064 + 9493065.

It is an arithmetic number, because the mean of its divisors is an integer number (9493065).

Almost surely, 2^18986129 is an apocalyptic number.

It is an amenable number.

18986129 is a deficient number, since it is larger than the sum of its proper divisors (1).

18986129 is an equidigital number, since it uses as much as digits as its factorization.

18986129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 44.

The square root of 18986129 is about 4357.3075402133. The cubic root of 18986129 is about 266.7752132754.

The spelling of 18986129 in words is "eighteen million, nine hundred eighty-six thousand, one hundred twenty-nine".