7995721 has 4 divisors (see below), whose sum is σ = 8181712. Its totient is φ = 7809732.

The previous prime is 7995683. The next prime is 7995727. The reversal of 7995721 is 1275997.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1275997 = 797 ⋅1601.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7995721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7995727) 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, 92931 + ... + 93016.

It is an arithmetic number, because the mean of its divisors is an integer number (2045428).

Almost surely, 2^7995721 is an apocalyptic number.

It is an amenable number.

7995721 is a deficient number, since it is larger than the sum of its proper divisors (185991).

7995721 is a wasteful number, since it uses less digits than its factorization.

7995721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185990.

The product of its digits is 39690, while the sum is 40.

The square root of 7995721 is about 2827.6705960914. The cubic root of 7995721 is about 199.9643353072.

The spelling of 7995721 in words is "seven million, nine hundred ninety-five thousand, seven hundred twenty-one".