7921256 has 32 divisors (see below), whose sum is σ = 17437440. Its totient is φ = 3302208.

The previous prime is 7921247. The next prime is 7921259. The reversal of 7921256 is 6521297.

It is a d-powerful number, because it can be written as 7⁸ + 9⁵ + 2⁵ + 1 + 2²¹ + 5 + 6³ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7921259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161 + ... + 3983.

It is an arithmetic number, because the mean of its divisors is an integer number (544920).

Almost surely, 2^7921256 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 7921256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8718720).

7921256 is an abundant number, since it is smaller than the sum of its proper divisors (9516184).

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

7921256 is a wasteful number, since it uses less digits than its factorization.

7921256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3873 (or 3869 counting only the distinct ones).

The product of its digits is 7560, while the sum is 32.

The square root of 7921256 is about 2814.4725971308. The cubic root of 7921256 is about 199.3416351567.

It can be divided in two parts, 7921 and 256, that multiplied together give a square (2027776 = 1424²).

The spelling of 7921256 in words is "seven million, nine hundred twenty-one thousand, two hundred fifty-six".