19973823 has 8 divisors (see below), whose sum is σ = 26661936. Its totient is φ = 13300800.

The previous prime is 19973819. The next prime is 19973843. The reversal of 19973823 is 32837991.

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

It is not a de Polignac number, because 19973823 - 2² = 19973819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19973803) 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, 198 + ... + 6323.

It is an arithmetic number, because the mean of its divisors is an integer number (3332742).

Almost surely, 2^19973823 is an apocalyptic number.

19973823 is a deficient number, since it is larger than the sum of its proper divisors (6688113).

19973823 is a wasteful number, since it uses less digits than its factorization.

19973823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7545.

The product of its digits is 81648, while the sum is 42.

The square root of 19973823 is about 4469.2083191545. The cubic root of 19973823 is about 271.3232844382.

The spelling of 19973823 in words is "nineteen million, nine hundred seventy-three thousand, eight hundred twenty-three".