40741721 has 4 divisors (see below), whose sum is σ = 40953012. Its totient is φ = 40530432.

The previous prime is 40741709. The next prime is 40741747. The reversal of 40741721 is 12714704.

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 14167696 + 26574025 = 3764^2 + 5155^2 .

It is a cyclic number.

It is not a de Polignac number, because 40741721 - 2¹⁴ = 40725337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40741751) 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, 105356 + ... + 105741.

It is an arithmetic number, because the mean of its divisors is an integer number (10238253).

Almost surely, 2^40741721 is an apocalyptic number.

It is an amenable number.

40741721 is a deficient number, since it is larger than the sum of its proper divisors (211291).

40741721 is a wasteful number, since it uses less digits than its factorization.

40741721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211290.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 40741721 is about 6382.9241731357. The cubic root of 40741721 is about 344.0961315298.

The spelling of 40741721 in words is "forty million, seven hundred forty-one thousand, seven hundred twenty-one".