19992923 has 4 divisors (see below), whose sum is σ = 20637888. Its totient is φ = 19347960.

The previous prime is 19992899. The next prime is 19992937. The reversal of 19992923 is 32929991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19992923 - 2¹² = 19988827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19922923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322436 + ... + 322497.

It is an arithmetic number, because the mean of its divisors is an integer number (5159472).

Almost surely, 2^19992923 is an apocalyptic number.

19992923 is a deficient number, since it is larger than the sum of its proper divisors (644965).

19992923 is an equidigital number, since it uses as much as digits as its factorization.

19992923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644964.

The product of its digits is 78732, while the sum is 44.

The square root of 19992923 is about 4471.3446523389. The cubic root of 19992923 is about 271.4097413266.

The spelling of 19992923 in words is "nineteen million, nine hundred ninety-two thousand, nine hundred twenty-three".