8089721 has 4 divisors (see below), whose sum is σ = 8441472. Its totient is φ = 7737972.

The previous prime is 8089693. The next prime is 8089727. The reversal of 8089721 is 1279808.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 8089721 - 2¹⁴ = 8073337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8089727) 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, 175841 + ... + 175886.

It is an arithmetic number, because the mean of its divisors is an integer number (2110368).

Almost surely, 2^8089721 is an apocalyptic number.

It is an amenable number.

8089721 is a deficient number, since it is larger than the sum of its proper divisors (351751).

8089721 is a wasteful number, since it uses less digits than its factorization.

8089721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351750.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 8089721 is about 2844.2434846546. The cubic root of 8089721 is about 200.7448971965.

The spelling of 8089721 in words is "eight million, eighty-nine thousand, seven hundred twenty-one".