891223242 has 64 divisors (see below), whose sum is σ = 2209751040. Its totient is φ = 233337024.

The previous prime is 891223231. The next prime is 891223303. The reversal of 891223242 is 242322198.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70023 + ... + 81765.

It is an arithmetic number, because the mean of its divisors is an integer number (34527360).

Almost surely, 2^891223242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 891223242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1104875520).

891223242 is an abundant number, since it is smaller than the sum of its proper divisors (1318527798).

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

891223242 is a wasteful number, since it uses less digits than its factorization.

891223242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11907.

The product of its digits is 13824, while the sum is 33.

The square root of 891223242 is about 29853.3623231957. The cubic root of 891223242 is about 962.3406577624.

The spelling of 891223242 in words is "eight hundred ninety-one million, two hundred twenty-three thousand, two hundred forty-two".