40391542721 has 8 divisors (see below), whose sum is σ = 42401184000. Its totient is φ = 38426069520.

The previous prime is 40391542679. The next prime is 40391542757. The reversal of 40391542721 is 12724519304.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40391542721 - 2³⁰ = 39317800897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40391542021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11040146 + ... + 11043803.

It is an arithmetic number, because the mean of its divisors is an integer number (5300148000).

Almost surely, 2^40391542721 is an apocalyptic number.

It is an amenable number.

40391542721 is a deficient number, since it is larger than the sum of its proper divisors (2009641279).

40391542721 is a wasteful number, since it uses less digits than its factorization.

40391542721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22084039.

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 40391542721 in words is "forty billion, three hundred ninety-one million, five hundred forty-two thousand, seven hundred twenty-one".