40340859721 has 4 divisors (see below), whose sum is σ = 40513996692. Its totient is φ = 40167722752.

The previous prime is 40340859719. The next prime is 40340859739. The reversal of 40340859721 is 12795804304.

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 2526168121 + 37814691600 = 50261^2 + 194460^2 .

It is a cyclic number.

It is not a de Polignac number, because 40340859721 - 2¹ = 40340859719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40340859701) 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, 86568136 + ... + 86568601.

It is an arithmetic number, because the mean of its divisors is an integer number (10128499173).

Almost surely, 2^40340859721 is an apocalyptic number.

It is an amenable number.

40340859721 is a deficient number, since it is larger than the sum of its proper divisors (173136971).

40340859721 is a wasteful number, since it uses less digits than its factorization.

40340859721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173136970.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 40340859721 in words is "forty billion, three hundred forty million, eight hundred fifty-nine thousand, seven hundred twenty-one".