18428719 has 2 divisors, whose sum is σ = 18428720. Its totient is φ = 18428718.

The previous prime is 18428713. The next prime is 18428737. The reversal of 18428719 is 91782481.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18428719 - 2²³ = 10040111 is a prime.

It is a super-2 number, since 2×18428719² = 679235367961922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18428713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9214359 + 9214360.

It is an arithmetic number, because the mean of its divisors is an integer number (9214360).

Almost surely, 2^18428719 is an apocalyptic number.

18428719 is a deficient number, since it is larger than the sum of its proper divisors (1).

18428719 is an equidigital number, since it uses as much as digits as its factorization.

18428719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 40.

The square root of 18428719 is about 4292.8683883856. The cubic root of 18428719 is about 264.1385053367.

The spelling of 18428719 in words is "eighteen million, four hundred twenty-eight thousand, seven hundred nineteen".