40043450819 has 4 divisors (see below), whose sum is σ = 42398947944. Its totient is φ = 37687953696.

The previous prime is 40043450813. The next prime is 40043450827. The reversal of 40043450819 is 91805434004.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40043450819 is a prime.

It is a super-2 number, since 2×40043450819² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40043450813) 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, 1177748537 + ... + 1177748570.

It is an arithmetic number, because the mean of its divisors is an integer number (10599736986).

Almost surely, 2^40043450819 is an apocalyptic number.

40043450819 is a deficient number, since it is larger than the sum of its proper divisors (2355497125).

40043450819 is a wasteful number, since it uses less digits than its factorization.

40043450819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2355497124.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 40043450819 in words is "forty billion, forty-three million, four hundred fifty thousand, eight hundred nineteen".