8893721 has 4 divisors (see below), whose sum is σ = 8961744. Its totient is φ = 8825700.

The previous prime is 8893697. The next prime is 8893751. The reversal of 8893721 is 1273988.

8893721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 8893721 - 2²² = 4699417 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8893751) 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, 33815 + ... + 34076.

It is an arithmetic number, because the mean of its divisors is an integer number (2240436).

Almost surely, 2^8893721 is an apocalyptic number.

It is an amenable number.

8893721 is a deficient number, since it is larger than the sum of its proper divisors (68023).

8893721 is a wasteful number, since it uses less digits than its factorization.

8893721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68022.

The product of its digits is 24192, while the sum is 38.

The square root of 8893721 is about 2982.2342295668. The cubic root of 8893721 is about 207.1863631624.

The spelling of 8893721 in words is "eight million, eight hundred ninety-three thousand, seven hundred twenty-one".