19327921 has 8 divisors (see below), whose sum is σ = 20386080. Its totient is φ = 18273888.

The previous prime is 19327909. The next prime is 19327927. The reversal of 19327921 is 12972391.

It is a happy number.

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 19327921 - 2⁹ = 19327409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19327927) 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, 15690 + ... + 16876.

It is an arithmetic number, because the mean of its divisors is an integer number (2548260).

Almost surely, 2^19327921 is an apocalyptic number.

It is an amenable number.

19327921 is a deficient number, since it is larger than the sum of its proper divisors (1058159).

19327921 is a wasteful number, since it uses less digits than its factorization.

19327921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063.

The product of its digits is 6804, while the sum is 34.

The square root of 19327921 is about 4396.3531477806. The cubic root of 19327921 is about 268.3665484476.

The spelling of 19327921 in words is "nineteen million, three hundred twenty-seven thousand, nine hundred twenty-one".