891155939430 has 128 divisors (see below), whose sum is σ = 2244920832000. Its totient is φ = 225972388224.

The previous prime is 891155939417. The next prime is 891155939447. The reversal of 891155939430 is 34939551198.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 115745721 + ... + 115753419.

It is an arithmetic number, because the mean of its divisors is an integer number (17538444000).

Almost surely, 2^891155939430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 891155939430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1122460416000).

891155939430 is an abundant number, since it is smaller than the sum of its proper divisors (1353764892570).

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

891155939430 is a wasteful number, since it uses less digits than its factorization.

891155939430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8698.

The product of its (nonzero) digits is 5248800, while the sum is 57.

The spelling of 891155939430 in words is "eight hundred ninety-one billion, one hundred fifty-five million, nine hundred thirty-nine thousand, four hundred thirty".