18791429 has 2 divisors, whose sum is σ = 18791430. Its totient is φ = 18791428.

The previous prime is 18791419. The next prime is 18791431. The reversal of 18791429 is 92419781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18258529 + 532900 = 4273^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 18791429 - 2⁴ = 18791413 is a prime.

Together with 18791431, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18791419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9395714 + 9395715.

It is an arithmetic number, because the mean of its divisors is an integer number (9395715).

Almost surely, 2^18791429 is an apocalyptic number.

It is an amenable number.

18791429 is a deficient number, since it is larger than the sum of its proper divisors (1).

18791429 is an equidigital number, since it uses as much as digits as its factorization.

18791429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 41.

The square root of 18791429 is about 4334.9081881858. The cubic root of 18791429 is about 265.8601645027.

The spelling of 18791429 in words is "eighteen million, seven hundred ninety-one thousand, four hundred twenty-nine".