18734519 has 2 divisors, whose sum is σ = 18734520. Its totient is φ = 18734518.

The previous prime is 18734497. The next prime is 18734531. The reversal of 18734519 is 91543781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18734519 - 2²⁴ = 1957303 is a prime.

It is a super-2 number, since 2×18734519² = 701964404322722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18734539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9367259 + 9367260.

It is an arithmetic number, because the mean of its divisors is an integer number (9367260).

Almost surely, 2^18734519 is an apocalyptic number.

18734519 is a deficient number, since it is larger than the sum of its proper divisors (1).

18734519 is an equidigital number, since it uses as much as digits as its factorization.

18734519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The square root of 18734519 is about 4328.3390578835. The cubic root of 18734519 is about 265.5915065312.

The spelling of 18734519 in words is "eighteen million, seven hundred thirty-four thousand, five hundred nineteen".