18439219 has 2 divisors, whose sum is σ = 18439220. Its totient is φ = 18439218.

The previous prime is 18439207. The next prime is 18439229. The reversal of 18439219 is 91293481.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18439219 is a prime.

It is a super-2 number, since 2×18439219² = 680009594659922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18439229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9219609 + 9219610.

It is an arithmetic number, because the mean of its divisors is an integer number (9219610).

Almost surely, 2^18439219 is an apocalyptic number.

18439219 is a deficient number, since it is larger than the sum of its proper divisors (1).

18439219 is an equidigital number, since it uses as much as digits as its factorization.

18439219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 18439219 is about 4294.0911727629. The cubic root of 18439219 is about 264.1886612506.

The spelling of 18439219 in words is "eighteen million, four hundred thirty-nine thousand, two hundred nineteen".