40443121 has 4 divisors (see below), whose sum is σ = 40485744. Its totient is φ = 40400500.

The previous prime is 40443107. The next prime is 40443133. The reversal of 40443121 is 12134404.

40443121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40443121 - 2⁵ = 40443089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40443721) 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 3 ways as a sum of consecutive naturals, for example, 19855 + ... + 21796.

It is an arithmetic number, because the mean of its divisors is an integer number (10121436).

Almost surely, 2^40443121 is an apocalyptic number.

It is an amenable number.

40443121 is a deficient number, since it is larger than the sum of its proper divisors (42623).

40443121 is an equidigital number, since it uses as much as digits as its factorization.

40443121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42622.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 40443121 is about 6359.4906242560. The cubic root of 40443121 is about 343.2534315169.

Adding to 40443121 its reverse (12134404), we get a palindrome (52577525).

The spelling of 40443121 in words is "forty million, four hundred forty-three thousand, one hundred twenty-one".