7921284 has 48 divisors (see below), whose sum is σ = 21280896. Its totient is φ = 2246400.

The previous prime is 7921273. The next prime is 7921289. The reversal of 7921284 is 4821297.

It is a happy number.

7921284 is digitally balanced in base 4 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is an Ulam number.

7921284 is strictly pandigital in base 8.

It is not an unprimeable number, because it can be changed into a prime (7921289) 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, 14944 + ... + 15464.

It is an arithmetic number, because the mean of its divisors is an integer number (443352).

Almost surely, 2^7921284 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 7921284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10640448).

7921284 is an abundant number, since it is smaller than the sum of its proper divisors (13359612).

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

7921284 is a wasteful number, since it uses less digits than its factorization.

7921284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716 (or 714 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 7921284 is about 2814.4775714153. The cubic root of 7921284 is about 199.3418700336.

The spelling of 7921284 in words is "seven million, nine hundred twenty-one thousand, two hundred eighty-four".