19849923 has 6 divisors (see below), whose sum is σ = 28672124. Its totient is φ = 13233276.

The previous prime is 19849913. The next prime is 19849939. The reversal of 19849923 is 32994891.

It is not a de Polignac number, because 19849923 - 2⁹ = 19849411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19849913) 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 5 ways as a sum of consecutive naturals, for example, 1102765 + ... + 1102782.

Almost surely, 2^19849923 is an apocalyptic number.

19849923 is a deficient number, since it is larger than the sum of its proper divisors (8822201).

19849923 is a wasteful number, since it uses less digits than its factorization.

19849923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2205553 (or 2205550 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 19849923 is about 4455.3252406530. The cubic root of 19849923 is about 270.7611035366.

The spelling of 19849923 in words is "nineteen million, eight hundred forty-nine thousand, nine hundred twenty-three".