19923172 has 12 divisors (see below), whose sum is σ = 36700720. Its totient is φ = 9437256.

The previous prime is 19923161. The next prime is 19923193. The reversal of 19923172 is 27132991.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130998 + ... + 131149.

Almost surely, 2^19923172 is an apocalyptic number.

It is an amenable number.

19923172 is a deficient number, since it is larger than the sum of its proper divisors (16777548).

19923172 is a wasteful number, since it uses less digits than its factorization.

19923172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262170 (or 262168 counting only the distinct ones).

The product of its digits is 6804, while the sum is 34.

The square root of 19923172 is about 4463.5380585361. The cubic root of 19923172 is about 271.0937435250.

The spelling of 19923172 in words is "nineteen million, nine hundred twenty-three thousand, one hundred seventy-two".