891378 has 32 divisors (see below), whose sum is σ = 2099520. Its totient is φ = 279360.

The previous prime is 891377. The next prime is 891379. The reversal of 891378 is 873198.

It is an interprime number because it is at equal distance from previous prime (891377) and next prime (891379).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (891377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 433 + ... + 1403.

It is an arithmetic number, because the mean of its divisors is an integer number (65610).

2⁸⁹¹³⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 891378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1049760).

891378 is an abundant number, since it is smaller than the sum of its proper divisors (1208142).

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

891378 is a wasteful number, since it uses less digits than its factorization.

891378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999 (or 993 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 891378 is about 944.1281692652. The cubic root of 891378 is about 96.2396356974.

The spelling of 891378 in words is "eight hundred ninety-one thousand, three hundred seventy-eight".