19999814 has 4 divisors (see below), whose sum is σ = 29999724. Its totient is φ = 9999906.

The previous prime is 19999789. The next prime is 19999817. The reversal of 19999814 is 41899991.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19999817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999952 + ... + 4999955.

It is an arithmetic number, because the mean of its divisors is an integer number (7499931).

Almost surely, 2^19999814 is an apocalyptic number.

19999814 is a deficient number, since it is larger than the sum of its proper divisors (9999910).

19999814 is an equidigital number, since it uses as much as digits as its factorization.

19999814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9999909.

The product of its digits is 209952, while the sum is 50.

The square root of 19999814 is about 4472.1151595190. The cubic root of 19999814 is about 271.4409201874.

It can be divided in two parts, 199998 and 14, that multiplied together give a palindrome (2799972).

The spelling of 19999814 in words is "nineteen million, nine hundred ninety-nine thousand, eight hundred fourteen".