19938823 has 4 divisors (see below), whose sum is σ = 19956888. Its totient is φ = 19920760.

The previous prime is 19938817. The next prime is 19938827. The reversal of 19938823 is 32883991.

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 19938823 - 2⁵ = 19938791 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19938823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19938827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7261 + ... + 9622.

It is an arithmetic number, because the mean of its divisors is an integer number (4989222).

Almost surely, 2^19938823 is an apocalyptic number.

19938823 is a deficient number, since it is larger than the sum of its proper divisors (18065).

19938823 is a wasteful number, since it uses less digits than its factorization.

19938823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18064.

The product of its digits is 93312, while the sum is 43.

The square root of 19938823 is about 4465.2909199737. The cubic root of 19938823 is about 271.1647124390.

It can be divided in two parts, 1993 and 8823, that added together give a square (10816 = 104²).

The spelling of 19938823 in words is "nineteen million, nine hundred thirty-eight thousand, eight hundred twenty-three".