40421443 has 2 divisors, whose sum is σ = 40421444. Its totient is φ = 40421442.

The previous prime is 40421413. The next prime is 40421453. The reversal of 40421443 is 34412404.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40421443 - 2⁵ = 40421411 is a prime.

It is not a weakly prime, because it can be changed into another prime (40421413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20210721 + 20210722.

It is an arithmetic number, because the mean of its divisors is an integer number (20210722).

Almost surely, 2^40421443 is an apocalyptic number.

40421443 is a deficient number, since it is larger than the sum of its proper divisors (1).

40421443 is an equidigital number, since it uses as much as digits as its factorization.

40421443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 40421443 is about 6357.7860140146. The cubic root of 40421443 is about 343.1920912313.

Adding to 40421443 its reverse (34412404), we get a palindrome (74833847).

The spelling of 40421443 in words is "forty million, four hundred twenty-one thousand, four hundred forty-three".