891039 has 8 divisors (see below), whose sum is σ = 1194160. Its totient is φ = 590976.

The previous prime is 891017. The next prime is 891047. The reversal of 891039 is 930198.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-891039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 890997 and 891015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39 + ... + 1335.

It is an arithmetic number, because the mean of its divisors is an integer number (149270).

2⁸⁹¹⁰³⁹ is an apocalyptic number.

891039 is a deficient number, since it is larger than the sum of its proper divisors (303121).

891039 is a wasteful number, since it uses less digits than its factorization.

891039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1529.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 891039 is about 943.9486214832. The cubic root of 891039 is about 96.2274338506.

It can be divided in two parts, 89 and 1039, that added together give a triangular number (1128 = T₄₇).

The spelling of 891039 in words is "eight hundred ninety-one thousand, thirty-nine".