19982321 has 8 divisors (see below), whose sum is σ = 20680704. Its totient is φ = 19287360.

The previous prime is 19982317. The next prime is 19982341. The reversal of 19982321 is 12328991.

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 19982321 - 2² = 19982317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19982341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17840 + ... + 18926.

It is an arithmetic number, because the mean of its divisors is an integer number (2585088).

Almost surely, 2^19982321 is an apocalyptic number.

It is an amenable number.

19982321 is a deficient number, since it is larger than the sum of its proper divisors (698383).

19982321 is a wasteful number, since it uses less digits than its factorization.

19982321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1711.

The product of its digits is 7776, while the sum is 35.

The square root of 19982321 is about 4470.1589457199. The cubic root of 19982321 is about 271.3617577666.

The spelling of 19982321 in words is "nineteen million, nine hundred eighty-two thousand, three hundred twenty-one".