19947443 has 8 divisors (see below), whose sum is σ = 21636720. Its totient is φ = 18315520.

The previous prime is 19947439. The next prime is 19947457. The reversal of 19947443 is 34474991.

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

It is not a de Polignac number, because 19947443 - 2² = 19947439 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

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 19947443.

It is not an unprimeable number, because it can be changed into a prime (19947413) 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, 13613 + ... + 15006.

It is an arithmetic number, because the mean of its divisors is an integer number (2704590).

Almost surely, 2^19947443 is an apocalyptic number.

19947443 is a deficient number, since it is larger than the sum of its proper divisors (1689277).

19947443 is a wasteful number, since it uses less digits than its factorization.

19947443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28677.

The product of its digits is 108864, while the sum is 41.

The square root of 19947443 is about 4466.2560383390. The cubic root of 19947443 is about 271.2037836697.

The spelling of 19947443 in words is "nineteen million, nine hundred forty-seven thousand, four hundred forty-three".