40830396721 has 4 divisors (see below), whose sum is σ = 40842238500. Its totient is φ = 40818554944.

The previous prime is 40830396713. The next prime is 40830396779. The reversal of 40830396721 is 12769303804.

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 202350625 + 40628046096 = 14225^2 + 201564^2 .

It is a cyclic number.

It is not a de Polignac number, because 40830396721 - 2³ = 40830396713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40830396121) 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, 5915716 + ... + 5922613.

It is an arithmetic number, because the mean of its divisors is an integer number (10210559625).

Almost surely, 2^40830396721 is an apocalyptic number.

It is an amenable number.

40830396721 is a deficient number, since it is larger than the sum of its proper divisors (11841779).

40830396721 is a wasteful number, since it uses less digits than its factorization.

40830396721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11841778.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 40830396721 in words is "forty billion, eight hundred thirty million, three hundred ninety-six thousand, seven hundred twenty-one".