19874923 has 4 divisors (see below), whose sum is σ = 19914480. Its totient is φ = 19835368.

The previous prime is 19874891. The next prime is 19874963. The reversal of 19874923 is 32947891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32947891 = 23 ⋅1432517.

It is a cyclic number.

It is not a de Polignac number, because 19874923 - 2⁵ = 19874891 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 19874923.

It is not an unprimeable number, because it can be changed into a prime (19874963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19015 + ... + 20032.

It is an arithmetic number, because the mean of its divisors is an integer number (4978620).

Almost surely, 2^19874923 is an apocalyptic number.

19874923 is a deficient number, since it is larger than the sum of its proper divisors (39557).

19874923 is an equidigital number, since it uses as much as digits as its factorization.

19874923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39556.

The product of its digits is 108864, while the sum is 43.

The square root of 19874923 is about 4458.1299891322. The cubic root of 19874923 is about 270.8747259391.

The spelling of 19874923 in words is "nineteen million, eight hundred seventy-four thousand, nine hundred twenty-three".