891436 has 48 divisors (see below), whose sum is σ = 2007040. Its totient is φ = 336960.

The previous prime is 891427. The next prime is 891439. The reversal of 891436 is 634198.

891436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 891398 and 891407.

It is not an unprimeable number, because it can be changed into a prime (891439) by changing a digit.

891436 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 15 ways as a sum of consecutive naturals, for example, 11245 + ... + 11323.

2⁸⁹¹⁴³⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 891436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1003520).

891436 is an abundant number, since it is smaller than the sum of its proper divisors (1115604).

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

891436 is a wasteful number, since it uses less digits than its factorization.

891436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 132 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 891436 is about 944.1588849341. The cubic root of 891436 is about 96.2417230191.

The spelling of 891436 in words is "eight hundred ninety-one thousand, four hundred thirty-six".