19989319 has 4 divisors (see below), whose sum is σ = 22844944. Its totient is φ = 17133696.

The previous prime is 19989289. The next prime is 19989329. The reversal of 19989319 is 91398991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91398991 = 37 ⋅2470243.

It is a cyclic number.

It is not a de Polignac number, because 19989319 - 2⁷ = 19989191 is a prime.

It is a super-2 number, since 2×19989319² = 799145748167522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19989329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1427802 + ... + 1427815.

It is an arithmetic number, because the mean of its divisors is an integer number (5711236).

Almost surely, 2^19989319 is an apocalyptic number.

19989319 is a deficient number, since it is larger than the sum of its proper divisors (2855625).

19989319 is an equidigital number, since it uses as much as digits as its factorization.

19989319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2855624.

The product of its digits is 157464, while the sum is 49.

The square root of 19989319 is about 4470.9416234167. The cubic root of 19989319 is about 271.3934318974.

The spelling of 19989319 in words is "nineteen million, nine hundred eighty-nine thousand, three hundred nineteen".