19988223 has 4 divisors (see below), whose sum is σ = 26650968. Its totient is φ = 13325480.

The previous prime is 19988183. The next prime is 19988233. The reversal of 19988223 is 32288991.

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 19988223 - 2¹⁸ = 19726079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19988233) 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, 3331368 + ... + 3331373.

It is an arithmetic number, because the mean of its divisors is an integer number (6662742).

Almost surely, 2^19988223 is an apocalyptic number.

19988223 is a deficient number, since it is larger than the sum of its proper divisors (6662745).

19988223 is an equidigital number, since it uses as much as digits as its factorization.

19988223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6662744.

The product of its digits is 62208, while the sum is 42.

The square root of 19988223 is about 4470.8190524780. The cubic root of 19988223 is about 271.3884717044.

The spelling of 19988223 in words is "nineteen million, nine hundred eighty-eight thousand, two hundred twenty-three".