19819473 has 8 divisors (see below), whose sum is σ = 26511648. Its totient is φ = 13170144.

The previous prime is 19819453. The next prime is 19819483. The reversal of 19819473 is 37491891.

It is a happy number.

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

It is not a de Polignac number, because 19819473 - 2²⁰ = 18770897 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19819453) 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, 9615 + ... + 11492.

It is an arithmetic number, because the mean of its divisors is an integer number (3313956).

Almost surely, 2^19819473 is an apocalyptic number.

It is an amenable number.

19819473 is a deficient number, since it is larger than the sum of its proper divisors (6692175).

19819473 is a wasteful number, since it uses less digits than its factorization.

19819473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21423.

The product of its digits is 54432, while the sum is 42.

The square root of 19819473 is about 4451.9066701808. The cubic root of 19819473 is about 270.6225825121.

The spelling of 19819473 in words is "nineteen million, eight hundred nineteen thousand, four hundred seventy-three".