18086429 has 2 divisors, whose sum is σ = 18086430. Its totient is φ = 18086428.

The previous prime is 18086417. The next prime is 18086473. The reversal of 18086429 is 92468081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10413529 + 7672900 = 3227^2 + 2770^2 .

It is an emirp because it is prime and its reverse (92468081) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18086429 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18086392 and 18086401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18086729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9043214 + 9043215.

It is an arithmetic number, because the mean of its divisors is an integer number (9043215).

Almost surely, 2^18086429 is an apocalyptic number.

It is an amenable number.

18086429 is a deficient number, since it is larger than the sum of its proper divisors (1).

18086429 is an equidigital number, since it uses as much as digits as its factorization.

18086429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 18086429 is about 4252.8142447090. The cubic root of 18086429 is about 262.4929292124.

The spelling of 18086429 in words is "eighteen million, eighty-six thousand, four hundred twenty-nine".