19921343 has 8 divisors (see below), whose sum is σ = 21504336. Its totient is φ = 18345600.

The previous prime is 19921337. The next prime is 19921357. The reversal of 19921343 is 34312991.

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

It is not a de Polignac number, because 19921343 - 2⁴ = 19921327 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 (19921303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4823 + ... + 7943.

It is an arithmetic number, because the mean of its divisors is an integer number (2688042).

Almost surely, 2^19921343 is an apocalyptic number.

19921343 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19921343 is a deficient number, since it is larger than the sum of its proper divisors (1582993).

19921343 is a wasteful number, since it uses less digits than its factorization.

19921343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3625.

The product of its digits is 5832, while the sum is 32.

The square root of 19921343 is about 4463.3331715210. Note that the first 3 decimals coincide. The cubic root of 19921343 is about 271.0854475630.

The spelling of 19921343 in words is "nineteen million, nine hundred twenty-one thousand, three hundred forty-three".