891378940 has 12 divisors (see below), whose sum is σ = 1871895816. Its totient is φ = 356551568.

The previous prime is 891378937. The next prime is 891378947. The reversal of 891378940 is 49873198.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891378947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22284454 + ... + 22284493.

It is an arithmetic number, because the mean of its divisors is an integer number (155991318).

Almost surely, 2^891378940 is an apocalyptic number.

It is an amenable number.

891378940 is an abundant number, since it is smaller than the sum of its proper divisors (980516876).

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

891378940 is a wasteful number, since it uses less digits than its factorization.

891378940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44568956 (or 44568954 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 891378940 is about 29855.9699222785. The cubic root of 891378940 is about 962.3966952713.

The spelling of 891378940 in words is "eight hundred ninety-one million, three hundred seventy-eight thousand, nine hundred forty".