19994111 has 4 divisors (see below), whose sum is σ = 20044872. Its totient is φ = 19943352.

The previous prime is 19994089. The next prime is 19994113. The reversal of 19994111 is 11149991.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 19994111 - 2⁶ = 19994047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19994113) 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, 24785 + ... + 25578.

It is an arithmetic number, because the mean of its divisors is an integer number (5011218).

Almost surely, 2^19994111 is an apocalyptic number.

19994111 is a deficient number, since it is larger than the sum of its proper divisors (50761).

19994111 is an equidigital number, since it uses as much as digits as its factorization.

19994111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50760.

The product of its digits is 2916, while the sum is 35.

The square root of 19994111 is about 4471.4774963092. The cubic root of 19994111 is about 271.4151170352.

The spelling of 19994111 in words is "nineteen million, nine hundred ninety-four thousand, one hundred eleven".