19788923 has 16 divisors (see below), whose sum is σ = 24800256. Its totient is φ = 15339840.

The previous prime is 19788893. The next prime is 19788929. The reversal of 19788923 is 32988791.

It is a cyclic number.

It is not a de Polignac number, because 19788923 - 2⁶ = 19788859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19788929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17390 + ... + 18492.

It is an arithmetic number, because the mean of its divisors is an integer number (1550016).

Almost surely, 2^19788923 is an apocalyptic number.

19788923 is a deficient number, since it is larger than the sum of its proper divisors (5011333).

19788923 is a wasteful number, since it uses less digits than its factorization.

19788923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354.

The product of its digits is 217728, while the sum is 47.

The square root of 19788923 is about 4448.4742328129. The cubic root of 19788923 is about 270.4834639220.

It can be divided in two parts, 1978 and 8923, that added together give a palindrome (10901).

The spelling of 19788923 in words is "nineteen million, seven hundred eighty-eight thousand, nine hundred twenty-three".