7121520 has 200 divisors, whose sum is σ = 28447584. Its totient is φ = 1617408.

The previous prime is 7121519. The next prime is 7121533. The reversal of 7121520 is 251217.

It is a super-2 number, since 2×7121520² = 101432094220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 7121493 and 7121502.

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 45282 + ... + 45438.

Almost surely, 2^7121520 is an apocalyptic number.

7121520 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7121520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14223792).

7121520 is an abundant number, since it is smaller than the sum of its proper divisors (21326064).

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

7121520 is a wasteful number, since it uses less digits than its factorization.

7121520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 7121520 is about 2668.6176196675. The cubic root of 7121520 is about 192.3937233125.

Adding to 7121520 its reverse (251217), we get a palindrome (7372737).

The spelling of 7121520 in words is "seven million, one hundred twenty-one thousand, five hundred twenty".