19998814 has 8 divisors (see below), whose sum is σ = 32725368. Its totient is φ = 9090360.

The previous prime is 19998809. The next prime is 19998841. The reversal of 19998814 is 41889991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×19998814² = 799905122813192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454497 + ... + 454540.

It is an arithmetic number, because the mean of its divisors is an integer number (4090671).

Almost surely, 2^19998814 is an apocalyptic number.

19998814 is a deficient number, since it is larger than the sum of its proper divisors (12726554).

19998814 is a wasteful number, since it uses less digits than its factorization.

19998814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909050.

The product of its digits is 186624, while the sum is 49.

The square root of 19998814 is about 4472.0033542027. The cubic root of 19998814 is about 271.4363960546.

It can be divided in two parts, 199988 and 14, that added together give a palindrome (200002).

The spelling of 19998814 in words is "nineteen million, nine hundred ninety-eight thousand, eight hundred fourteen".