891994740 has 192 divisors, whose sum is σ = 3208052736. Its totient is φ = 179993088.

The previous prime is 891994721. The next prime is 891994759. The reversal of 891994740 is 47499198.

It is an interprime number because it is at equal distance from previous prime (891994721) and next prime (891994759).

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, 122029 + ... + 129131.

It is an arithmetic number, because the mean of its divisors is an integer number (16708608).

Almost surely, 2^891994740 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 891994740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1604026368).

891994740 is an abundant number, since it is smaller than the sum of its proper divisors (2316057996).

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

891994740 is a wasteful number, since it uses less digits than its factorization.

891994740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7158 (or 7156 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 51.

The square root of 891994740 is about 29866.2809870931. The cubic root of 891994740 is about 962.6182648854.

It can be divided in two parts, 89199 and 4740, that added together give a palindrome (93939).

The spelling of 891994740 in words is "eight hundred ninety-one million, nine hundred ninety-four thousand, seven hundred forty".