40493639843 has 4 divisors (see below), whose sum is σ = 40514809368. Its totient is φ = 40472470320.

The previous prime is 40493639783. The next prime is 40493639891. The reversal of 40493639843 is 34893639404.

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 40493639843 - 2⁸ = 40493639587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40493639443) 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, 10581893 + ... + 10585718.

It is an arithmetic number, because the mean of its divisors is an integer number (10128702342).

Almost surely, 2^40493639843 is an apocalyptic number.

40493639843 is a deficient number, since it is larger than the sum of its proper divisors (21169525).

40493639843 is a wasteful number, since it uses less digits than its factorization.

40493639843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21169524.

The product of its (nonzero) digits is 6718464, while the sum is 53.

The spelling of 40493639843 in words is "forty billion, four hundred ninety-three million, six hundred thirty-nine thousand, eight hundred forty-three".