891243 has 10 divisors (see below), whose sum is σ = 1331484. Its totient is φ = 594108.

The previous prime is 891239. The next prime is 891251. The reversal of 891243 is 342198.

It is not a de Polignac number, because 891243 - 2² = 891239 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

891243 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (891223) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5421 + ... + 5582.

2⁸⁹¹²⁴³ is an apocalyptic number.

891243 is a deficient number, since it is larger than the sum of its proper divisors (440241).

891243 is a wasteful number, since it uses less digits than its factorization.

891243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11015 (or 11006 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 891243 is about 944.0566720277. The cubic root of 891243 is about 96.2347769256.

The spelling of 891243 in words is "eight hundred ninety-one thousand, two hundred forty-three".