7948821 has 16 divisors (see below), whose sum is σ = 11460800. Its totient is φ = 4883328.

The previous prime is 7948817. The next prime is 7948841. The reversal of 7948821 is 1288497.

It is not a de Polignac number, because 7948821 - 2² = 7948817 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7948821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7948841) 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 15 ways as a sum of consecutive naturals, for example, 225 + ... + 3993.

It is an arithmetic number, because the mean of its divisors is an integer number (716300).

Almost surely, 2^7948821 is an apocalyptic number.

It is an amenable number.

7948821 is a deficient number, since it is larger than the sum of its proper divisors (3511979).

7948821 is a wasteful number, since it uses less digits than its factorization.

7948821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3828.

The product of its digits is 32256, while the sum is 39.

The square root of 7948821 is about 2819.3653541178. The cubic root of 7948821 is about 199.5725956114.

The spelling of 7948821 in words is "seven million, nine hundred forty-eight thousand, eight hundred twenty-one".