40243643 has 4 divisors (see below), whose sum is σ = 43902168. Its totient is φ = 36585120.

The previous prime is 40243631. The next prime is 40243661. The reversal of 40243643 is 34634204.

40243643 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.

It is not a de Polignac number, because 40243643 - 2⁶ = 40243579 is a prime.

It is a super-2 number, since 2×40243643² = 3239101603822898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40243243) 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, 1829246 + ... + 1829267.

It is an arithmetic number, because the mean of its divisors is an integer number (10975542).

Almost surely, 2^40243643 is an apocalyptic number.

40243643 is a deficient number, since it is larger than the sum of its proper divisors (3658525).

40243643 is a wasteful number, since it uses less digits than its factorization.

40243643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3658524.

The product of its (nonzero) digits is 6912, while the sum is 26.

The square root of 40243643 is about 6343.7877486562. The cubic root of 40243643 is about 342.6881570439.

Adding to 40243643 its reverse (34634204), we get a palindrome (74877847).

It can be divided in two parts, 4024 and 3643, that added together give a palindrome (7667).

The spelling of 40243643 in words is "forty million, two hundred forty-three thousand, six hundred forty-three".