19940443 has 4 divisors (see below), whose sum is σ = 20989960. Its totient is φ = 18890928.

The previous prime is 19940423. The next prime is 19940449. The reversal of 19940443 is 34404991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19940443 - 2⁵ = 19940411 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19940399 and 19940408.

It is not an unprimeable number, because it can be changed into a prime (19940449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 524730 + ... + 524767.

It is an arithmetic number, because the mean of its divisors is an integer number (5247490).

Almost surely, 2^19940443 is an apocalyptic number.

19940443 is a deficient number, since it is larger than the sum of its proper divisors (1049517).

19940443 is a wasteful number, since it uses less digits than its factorization.

19940443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049516.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 19940443 is about 4465.4723154444. The cubic root of 19940443 is about 271.1720561512.

The spelling of 19940443 in words is "nineteen million, nine hundred forty thousand, four hundred forty-three".