7121920 has 88 divisors (see below), whose sum is σ = 18570384. Its totient is φ = 2605056.

The previous prime is 7121879. The next prime is 7121921. The reversal of 7121920 is 291217.

It is a junction number, because it is equal to n+sod(n) for n = 7121891 and 7121900.

It is not an unprimeable number, because it can be changed into a prime (7121921) 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, 66507 + ... + 66613.

Almost surely, 2^7121920 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 7121920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9285192).

7121920 is an abundant number, since it is smaller than the sum of its proper divisors (11448464).

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

7121920 is a wasteful number, since it uses less digits than its factorization.

7121920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 7121920 is about 2668.6925637847. The cubic root of 7121920 is about 192.3973253547.

The spelling of 7121920 in words is "seven million, one hundred twenty-one thousand, nine hundred twenty".