7821120 has 56 divisors (see below), whose sum is σ = 24835104. Its totient is φ = 2085376.

The previous prime is 7821101. The next prime is 7821133. The reversal of 7821120 is 211287.

It is a super-2 number, since 2×7821120² = 122339836108800, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3114 + ... + 5033.

It is an arithmetic number, because the mean of its divisors is an integer number (443484).

Almost surely, 2^7821120 is an apocalyptic number.

It is an amenable number.

7821120 is an abundant number, since it is smaller than the sum of its proper divisors (17013984).

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

7821120 is a wasteful number, since it uses less digits than its factorization.

7821120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8167 (or 8157 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 7821120 is about 2796.6265392433. The cubic root of 7821120 is about 198.4980827898.

The spelling of 7821120 in words is "seven million, eight hundred twenty-one thousand, one hundred twenty".