891831930 has 64 divisors (see below), whose sum is σ = 2342850048. Its totient is φ = 215472960.

The previous prime is 891831859. The next prime is 891831931. The reversal of 891831930 is 39138198.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (891831931) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96909 + ... + 105711.

It is an arithmetic number, because the mean of its divisors is an integer number (36607032).

Almost surely, 2^891831930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 891831930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1171425024).

891831930 is an abundant number, since it is smaller than the sum of its proper divisors (1451018118).

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

891831930 is a wasteful number, since it uses less digits than its factorization.

891831930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9131.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 891831930 is about 29863.5552136714. Note that the first 3 decimals coincide. The cubic root of 891831930 is about 962.5596945042.

The spelling of 891831930 in words is "eight hundred ninety-one million, eight hundred thirty-one thousand, nine hundred thirty".