7921255 has 8 divisors (see below), whose sum is σ = 9539712. Its totient is φ = 6314208.

The previous prime is 7921247. The next prime is 7921259. The reversal of 7921255 is 5521297.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7921255 - 2³ = 7921247 is a prime.

It is a d-powerful number, because it can be written as 7⁸ + 9⁵ + 2 + 1 + 2²¹ + 5³ + 5³ .

It is a Duffinian number.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1239 + ... + 4168.

It is an arithmetic number, because the mean of its divisors is an integer number (1192464).

Almost surely, 2^7921255 is an apocalyptic number.

7921255 is a deficient number, since it is larger than the sum of its proper divisors (1618457).

7921255 is a wasteful number, since it uses less digits than its factorization.

7921255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5705.

The product of its digits is 6300, while the sum is 31.

The square root of 7921255 is about 2814.4724194776. The cubic root of 7921255 is about 199.3416267682.

The spelling of 7921255 in words is "seven million, nine hundred twenty-one thousand, two hundred fifty-five".