19981423 has 8 divisors (see below), whose sum is σ = 24912000. Its totient is φ = 15569880.

The previous prime is 19981417. The next prime is 19981427. The reversal of 19981423 is 32418991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19981423 - 2⁹ = 19980911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19981427) 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 7 ways as a sum of consecutive naturals, for example, 129673 + ... + 129826.

It is an arithmetic number, because the mean of its divisors is an integer number (3114000).

Almost surely, 2^19981423 is an apocalyptic number.

19981423 is a deficient number, since it is larger than the sum of its proper divisors (4930577).

19981423 is a wasteful number, since it uses less digits than its factorization.

19981423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259517.

The product of its digits is 15552, while the sum is 37.

The square root of 19981423 is about 4470.0585007358. The cubic root of 19981423 is about 271.3576927315.

The spelling of 19981423 in words is "nineteen million, nine hundred eighty-one thousand, four hundred twenty-three".