40004443 has 4 divisors (see below), whose sum is σ = 42109960. Its totient is φ = 37898928.

The previous prime is 40004413. The next prime is 40004467. The reversal of 40004443 is 34440004.

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 40004443 - 2¹⁷ = 39873371 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 2105497 = 40004443 / (4 + 0 + 0 + 0 + 4 + 4 + 4 + 3).

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 40004443.

It is not an unprimeable number, because it can be changed into a prime (40004413) 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, 1052730 + ... + 1052767.

It is an arithmetic number, because the mean of its divisors is an integer number (10527490).

Almost surely, 2^40004443 is an apocalyptic number.

40004443 is a deficient number, since it is larger than the sum of its proper divisors (2105517).

40004443 is a wasteful number, since it uses less digits than its factorization.

40004443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2105516.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 40004443 is about 6324.9065605746. The cubic root of 40004443 is about 342.0078512384.

Adding to 40004443 its reverse (34440004), we get a palindrome (74444447).

The spelling of 40004443 in words is "forty million, four thousand, four hundred forty-three".