8041721 has 4 divisors (see below), whose sum is σ = 8121444. Its totient is φ = 7962000.

The previous prime is 8041717. The next prime is 8041723. The reversal of 8041721 is 1271408.

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 5017600 + 3024121 = 2240^2 + 1739^2 .

It is a cyclic number.

It is not a de Polignac number, because 8041721 - 2² = 8041717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8041723) 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, 39710 + ... + 39911.

It is an arithmetic number, because the mean of its divisors is an integer number (2030361).

Almost surely, 2^8041721 is an apocalyptic number.

It is an amenable number.

8041721 is a deficient number, since it is larger than the sum of its proper divisors (79723).

8041721 is a wasteful number, since it uses less digits than its factorization.

8041721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79722.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 8041721 is about 2835.7928344645. The cubic root of 8041721 is about 200.3470723555.

The spelling of 8041721 in words is "eight million, forty-one thousand, seven hundred twenty-one".