7891312 has 40 divisors (see below), whose sum is σ = 17967600. Its totient is φ = 3310080.

The previous prime is 7891307. The next prime is 7891313. The reversal of 7891312 is 2131987.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7891313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 564 + ... + 4012.

It is an arithmetic number, because the mean of its divisors is an integer number (449190).

Almost surely, 2^7891312 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 7891312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8983800).

7891312 is an abundant number, since it is smaller than the sum of its proper divisors (10076288).

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

7891312 is a wasteful number, since it uses less digits than its factorization.

7891312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3481 (or 3475 counting only the distinct ones).

The product of its digits is 3024, while the sum is 31.

The square root of 7891312 is about 2809.1479135140. The cubic root of 7891312 is about 199.0901336599.

The spelling of 7891312 in words is "seven million, eight hundred ninety-one thousand, three hundred twelve".