18240419 has 2 divisors, whose sum is σ = 18240420. Its totient is φ = 18240418.

The previous prime is 18240413. The next prime is 18240463. The reversal of 18240419 is 91404281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18240419 - 2²⁰ = 17191843 is a prime.

It is a super-2 number, since 2×18240419² = 665425770591122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18240391 and 18240400.

It is not a weakly prime, because it can be changed into another prime (18240413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9120209 + 9120210.

It is an arithmetic number, because the mean of its divisors is an integer number (9120210).

Almost surely, 2^18240419 is an apocalyptic number.

18240419 is a deficient number, since it is larger than the sum of its proper divisors (1).

18240419 is an equidigital number, since it uses as much as digits as its factorization.

18240419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 18240419 is about 4270.8803542127. The cubic root of 18240419 is about 263.2357902183.

The spelling of 18240419 in words is "eighteen million, two hundred forty thousand, four hundred nineteen".