891900 has 54 divisors (see below), whose sum is σ = 2798432. Its totient is φ = 237600.

The previous prime is 891899. The next prime is 891907. The reversal of 891900 is 9198.

It is a super-2 number, since 2×891900² = 1590971220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891907) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 405 + ... + 1395.

2⁸⁹¹⁹⁰⁰ 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 891900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1399216).

891900 is an abundant number, since it is smaller than the sum of its proper divisors (1906532).

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

891900 is a wasteful number, since it uses less digits than its factorization.

891900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011 (or 1001 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 891900 is about 944.4045743218. The cubic root of 891900 is about 96.2584183338.

The spelling of 891900 in words is "eight hundred ninety-one thousand, nine hundred".