40021443 has 24 divisors (see below), whose sum is σ = 72074496. Its totient is φ = 20790000.

The previous prime is 40021427. The next prime is 40021459. The reversal of 40021443 is 34412004.

40021443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (40021427) and next prime (40021459).

It is not a de Polignac number, because 40021443 - 2⁴ = 40021427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40021463) 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 23 ways as a sum of consecutive naturals, for example, 28183 + ... + 29568.

It is an arithmetic number, because the mean of its divisors is an integer number (3003104).

Almost surely, 2^40021443 is an apocalyptic number.

40021443 is a deficient number, since it is larger than the sum of its proper divisors (32053053).

40021443 is a wasteful number, since it uses less digits than its factorization.

40021443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57775 (or 57772 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 40021443 is about 6326.2503112033. The cubic root of 40021443 is about 342.0562901088.

Adding to 40021443 its reverse (34412004), we get a palindrome (74433447).

It can be divided in two parts, 4002 and 1443, that added together give a palindrome (5445).

The spelling of 40021443 in words is "forty million, twenty-one thousand, four hundred forty-three".