889865 has 24 divisors (see below), whose sum is σ = 1234440. Its totient is φ = 612864.

The previous prime is 889829. The next prime is 889871. The reversal of 889865 is 568988.

It can be written as a sum of positive squares in 4 ways, for example, as 190969 + 698896 = 437^2 + 836^2 .

It is not a de Polignac number, because 889865 - 2¹² = 885769 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30671 + ... + 30699.

It is an arithmetic number, because the mean of its divisors is an integer number (51435).

2⁸⁸⁹⁸⁶⁵ is an apocalyptic number.

889865 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

889865 is a deficient number, since it is larger than the sum of its proper divisors (344575).

889865 is a wasteful number, since it uses less digits than its factorization.

889865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 70 counting only the distinct ones).

The product of its digits is 138240, while the sum is 44.

The square root of 889865 is about 943.3265606353. The cubic root of 889865 is about 96.1851533746.

The spelling of 889865 in words is "eight hundred eighty-nine thousand, eight hundred sixty-five".