8733721 has 4 divisors (see below), whose sum is σ = 9113472. Its totient is φ = 8353972.

The previous prime is 8733719. The next prime is 8733731. The reversal of 8733721 is 1273378.

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 8733721 - 2¹ = 8733719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8733701) 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, 189841 + ... + 189886.

It is an arithmetic number, because the mean of its divisors is an integer number (2278368).

Almost surely, 2^8733721 is an apocalyptic number.

It is an amenable number.

8733721 is a deficient number, since it is larger than the sum of its proper divisors (379751).

8733721 is a wasteful number, since it uses less digits than its factorization.

8733721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379750.

The product of its digits is 7056, while the sum is 31.

The square root of 8733721 is about 2955.2869573021. The cubic root of 8733721 is about 205.9363944138.

The spelling of 8733721 in words is "eight million, seven hundred thirty-three thousand, seven hundred twenty-one".