891040 has 24 divisors (see below), whose sum is σ = 2105460. Its totient is φ = 356352.

The previous prime is 891017. The next prime is 891047. The reversal of 891040 is 40198.

It can be written as a sum of positive squares in 2 ways, for example, as 839056 + 51984 = 916^2 + 228^2 .

It is not an unprimeable number, because it can be changed into a prime (891047) by changing a digit.

891040 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2625 + ... + 2944.

2⁸⁹¹⁰⁴⁰ is an apocalyptic number.

891040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

891040 is an abundant number, since it is smaller than the sum of its proper divisors (1214420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

891040 is a wasteful number, since it uses less digits than its factorization.

891040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5584 (or 5576 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 891040 is about 943.9491511729. The cubic root of 891040 is about 96.2274698488.

The spelling of 891040 in words is "eight hundred ninety-one thousand, forty".