891398144 has 96 divisors (see below), whose sum is σ = 2194133760. Its totient is φ = 352567296.

The previous prime is 891398093. The next prime is 891398147. The reversal of 891398144 is 441893198.

It is a super-2 number, since 2×891398144² = 1589181302253289472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (891398147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183977 + ... + 188759.

It is an arithmetic number, because the mean of its divisors is an integer number (22855560).

Almost surely, 2^891398144 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 891398144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1097066880).

891398144 is an abundant number, since it is smaller than the sum of its proper divisors (1302735616).

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

891398144 is a wasteful number, since it uses less digits than its factorization.

891398144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4825 (or 4805 counting only the distinct ones).

The product of its digits is 248832, while the sum is 47.

The square root of 891398144 is about 29856.2915312669. The cubic root of 891398144 is about 962.4036065607.

The spelling of 891398144 in words is "eight hundred ninety-one million, three hundred ninety-eight thousand, one hundred forty-four".