18739619 has 2 divisors, whose sum is σ = 18739620. Its totient is φ = 18739618.

The previous prime is 18739603. The next prime is 18739663. The reversal of 18739619 is 91693781.

It is an a-pointer prime, because the next prime (18739663) can be obtained adding 18739619 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18739619 - 2⁴ = 18739603 is a prime.

It is a super-2 number, since 2×18739619² = 702346640530322, 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 18739619.

It is not a weakly prime, because it can be changed into another prime (18739519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9369809 + 9369810.

It is an arithmetic number, because the mean of its divisors is an integer number (9369810).

Almost surely, 2^18739619 is an apocalyptic number.

18739619 is a deficient number, since it is larger than the sum of its proper divisors (1).

18739619 is an equidigital number, since it uses as much as digits as its factorization.

18739619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 18739619 is about 4328.9281583320. The cubic root of 18739619 is about 265.6156045396.

The spelling of 18739619 in words is "eighteen million, seven hundred thirty-nine thousand, six hundred nineteen".