19896321 has 8 divisors (see below), whose sum is σ = 26719840. Its totient is φ = 13168512.

The previous prime is 19896319. The next prime is 19896377. The reversal of 19896321 is 12369891.

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

It is not a de Polignac number, because 19896321 - 2¹ = 19896319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19896321.

It is not an unprimeable number, because it can be changed into a prime (19896391) 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, 23440 + ... + 24273.

It is an arithmetic number, because the mean of its divisors is an integer number (3339980).

Almost surely, 2^19896321 is an apocalyptic number.

It is an amenable number.

19896321 is a deficient number, since it is larger than the sum of its proper divisors (6823519).

19896321 is a wasteful number, since it uses less digits than its factorization.

19896321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47855.

The product of its digits is 23328, while the sum is 39.

The square root of 19896321 is about 4460.5292286902. The cubic root of 19896321 is about 270.9719019719.

The spelling of 19896321 in words is "nineteen million, eight hundred ninety-six thousand, three hundred twenty-one".