19887223 has 4 divisors (see below), whose sum is σ = 20139040. Its totient is φ = 19635408.

The previous prime is 19887221. The next prime is 19887247. The reversal of 19887223 is 32278891.

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 19887223 - 2¹ = 19887221 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 (19887221) 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, 125790 + ... + 125947.

It is an arithmetic number, because the mean of its divisors is an integer number (5034760).

Almost surely, 2^19887223 is an apocalyptic number.

19887223 is a deficient number, since it is larger than the sum of its proper divisors (251817).

19887223 is an equidigital number, since it uses as much as digits as its factorization.

19887223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251816.

The product of its digits is 48384, while the sum is 40.

The square root of 19887223 is about 4459.5092779363. The cubic root of 19887223 is about 270.9305931921.

The spelling of 19887223 in words is "nineteen million, eight hundred eighty-seven thousand, two hundred twenty-three".