19992243 has 8 divisors (see below), whose sum is σ = 26920656. Its totient is φ = 13196000.

The previous prime is 19992233. The next prime is 19992257. The reversal of 19992243 is 34229991.

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

It is a cyclic number.

It is not a de Polignac number, because 19992243 - 2⁴ = 19992227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19992233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32688 + ... + 33293.

It is an arithmetic number, because the mean of its divisors is an integer number (3365082).

Almost surely, 2^19992243 is an apocalyptic number.

19992243 is a deficient number, since it is larger than the sum of its proper divisors (6928413).

19992243 is a wasteful number, since it uses less digits than its factorization.

19992243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66085.

The product of its digits is 34992, while the sum is 39.

The square root of 19992243 is about 4471.2686119266. The cubic root of 19992243 is about 271.4066642258.

The spelling of 19992243 in words is "nineteen million, nine hundred ninety-two thousand, two hundred forty-three".