18709519 has 2 divisors, whose sum is σ = 18709520. Its totient is φ = 18709518.

The previous prime is 18709517. The next prime is 18709573. The reversal of 18709519 is 91590781.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18709519 - 2¹ = 18709517 is a prime.

It is a super-2 number, since 2×18709519² = 700092202422722, which contains 22 as substring.

Together with 18709517, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18709517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9354759 + 9354760.

It is an arithmetic number, because the mean of its divisors is an integer number (9354760).

Almost surely, 2^18709519 is an apocalyptic number.

18709519 is a deficient number, since it is larger than the sum of its proper divisors (1).

18709519 is an equidigital number, since it uses as much as digits as its factorization.

18709519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 18709519 is about 4325.4501499844. The cubic root of 18709519 is about 265.4733157322.

The spelling of 18709519 in words is "eighteen million, seven hundred nine thousand, five hundred nineteen".