7321920 has 112 divisors (see below), whose sum is σ = 24140160. Its totient is φ = 1878016.

The previous prime is 7321913. The next prime is 7321927. The reversal of 7321920 is 291237.

7321920 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (7321913) and next prime (7321927).

It is a super-2 number, since 2×7321920² = 107221024972800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7321927) 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, 27709 + ... + 27971.

Almost surely, 2^7321920 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 7321920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12070080).

7321920 is an abundant number, since it is smaller than the sum of its proper divisors (16818240).

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

7321920 is a wasteful number, since it uses less digits than its factorization.

7321920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 7321920 is about 2705.9046546396. The cubic root of 7321920 is about 194.1817123386.

The spelling of 7321920 in words is "seven million, three hundred twenty-one thousand, nine hundred twenty".