19897379 has 8 divisors (see below), whose sum is σ = 20620320. Its totient is φ = 19184256.

The previous prime is 19897373. The next prime is 19897387. The reversal of 19897379 is 97379891.

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 19897379 - 2⁴ = 19897363 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 19897379.

It is not an unprimeable number, because it can be changed into a prime (19897373) 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, 1802 + ... + 6560.

It is an arithmetic number, because the mean of its divisors is an integer number (2577540).

Almost surely, 2^19897379 is an apocalyptic number.

19897379 is a deficient number, since it is larger than the sum of its proper divisors (722941).

19897379 is a wasteful number, since it uses less digits than its factorization.

19897379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4909.

The product of its digits is 857304, while the sum is 53.

The square root of 19897379 is about 4460.6478229064. The cubic root of 19897379 is about 270.9767049234.

The spelling of 19897379 in words is "nineteen million, eight hundred ninety-seven thousand, three hundred seventy-nine".