889639 has 2 divisors, whose sum is σ = 889640. Its totient is φ = 889638.

The previous prime is 889631. The next prime is 889657. The reversal of 889639 is 936988.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 889639 - 2³ = 889631 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 889595 and 889604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (889631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 444819 + 444820.

It is an arithmetic number, because the mean of its divisors is an integer number (444820).

2⁸⁸⁹⁶³⁹ is an apocalyptic number.

889639 is a deficient number, since it is larger than the sum of its proper divisors (1).

889639 is an equidigital number, since it uses as much as digits as its factorization.

889639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 43.

The square root of 889639 is about 943.2067641827. The cubic root of 889639 is about 96.1770099352.

The spelling of 889639 in words is "eight hundred eighty-nine thousand, six hundred thirty-nine".