40637843 has 4 divisors (see below), whose sum is σ = 41326680. Its totient is φ = 39949008.

The previous prime is 40637809. The next prime is 40637893. The reversal of 40637843 is 34873604.

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

It is a cyclic number.

It is not a de Polignac number, because 40637843 - 2²⁰ = 39589267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40637893) 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, 344330 + ... + 344447.

It is an arithmetic number, because the mean of its divisors is an integer number (10331670).

Almost surely, 2^40637843 is an apocalyptic number.

40637843 is a deficient number, since it is larger than the sum of its proper divisors (688837).

40637843 is an equidigital number, since it uses as much as digits as its factorization.

40637843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688836.

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 40637843 is about 6374.7818001874. The cubic root of 40637843 is about 343.8034386122.

The spelling of 40637843 in words is "forty million, six hundred thirty-seven thousand, eight hundred forty-three".