889721 has 4 divisors (see below), whose sum is σ = 1016832. Its totient is φ = 762612.

The previous prime is 889703. The next prime is 889727. The reversal of 889721 is 127988.

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 889721 - 2⁶ = 889657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (889727) 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, 63545 + ... + 63558.

It is an arithmetic number, because the mean of its divisors is an integer number (254208).

2⁸⁸⁹⁷²¹ is an apocalyptic number.

It is an amenable number.

889721 is a deficient number, since it is larger than the sum of its proper divisors (127111).

889721 is a wasteful number, since it uses less digits than its factorization.

889721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127110.

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

The square root of 889721 is about 943.2502319109. The cubic root of 889721 is about 96.1799647939.

The spelling of 889721 in words is "eight hundred eighty-nine thousand, seven hundred twenty-one".