7121128 has 16 divisors (see below), whose sum is σ = 15259680. Its totient is φ = 3051888.

The previous prime is 7121089. The next prime is 7121137. The reversal of 7121128 is 8211217.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 7121099 and 7121108.

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 3 ways as a sum of consecutive naturals, for example, 63526 + ... + 63637.

It is an arithmetic number, because the mean of its divisors is an integer number (953730).

Almost surely, 2^7121128 is an apocalyptic number.

It is an amenable number.

7121128 is an abundant number, since it is smaller than the sum of its proper divisors (8138552).

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

7121128 is a wasteful number, since it uses less digits than its factorization.

7121128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127176 (or 127172 counting only the distinct ones).

The product of its digits is 224, while the sum is 22.

The square root of 7121128 is about 2668.5441723906. The cubic root of 7121128 is about 192.3901931802.

The spelling of 7121128 in words is "seven million, one hundred twenty-one thousand, one hundred twenty-eight".