40443281 has 4 divisors (see below), whose sum is σ = 40493364. Its totient is φ = 40393200.

The previous prime is 40443217. The next prime is 40443283. The reversal of 40443281 is 18234404.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11498881 + 28944400 = 3391^2 + 5380^2 .

It is not a de Polignac number, because 40443281 - 2⁶ = 40443217 is a prime.

It is a super-2 number, since 2×40443281² = 3271317956089922, which contains 22 as substring.

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 40443281.

It is not an unprimeable number, because it can be changed into a prime (40443283) 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, 23810 + ... + 25451.

It is an arithmetic number, because the mean of its divisors is an integer number (10123341).

Almost surely, 2^40443281 is an apocalyptic number.

It is an amenable number.

40443281 is a deficient number, since it is larger than the sum of its proper divisors (50083).

40443281 is an equidigital number, since it uses as much as digits as its factorization.

40443281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50082.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 40443281 is about 6359.5032038674. The cubic root of 40443281 is about 343.2538841730.

Adding to 40443281 its reverse (18234404), we get a palindrome (58677685).

The spelling of 40443281 in words is "forty million, four hundred forty-three thousand, two hundred eighty-one".