18340019 has 2 divisors, whose sum is σ = 18340020. Its totient is φ = 18340018.

The previous prime is 18339913. The next prime is 18340033. The reversal of 18340019 is 91004381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18340019 - 2¹² = 18335923 is a prime.

It is a super-2 number, since 2×18340019² = 672712593840722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18340019.

It is not a weakly prime, because it can be changed into another prime (18340219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9170009 + 9170010.

It is an arithmetic number, because the mean of its divisors is an integer number (9170010).

Almost surely, 2^18340019 is an apocalyptic number.

18340019 is a deficient number, since it is larger than the sum of its proper divisors (1).

18340019 is an equidigital number, since it uses as much as digits as its factorization.

18340019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 18340019 is about 4282.5248393909. The cubic root of 18340019 is about 263.7140450977.

The spelling of 18340019 in words is "eighteen million, three hundred forty thousand, nineteen".