7121688 has 32 divisors (see below), whose sum is σ = 20348160. Its totient is φ = 2034720.

The previous prime is 7121687. The next prime is 7121693. The reversal of 7121688 is 8861217.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7121683) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 21028 + ... + 21363.

It is an arithmetic number, because the mean of its divisors is an integer number (635880).

Almost surely, 2^7121688 is an apocalyptic number.

It is an amenable number.

7121688 is an abundant number, since it is smaller than the sum of its proper divisors (13226472).

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

7121688 is a wasteful number, since it uses less digits than its factorization.

7121688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42407 (or 42403 counting only the distinct ones).

The product of its digits is 5376, while the sum is 33.

The square root of 7121688 is about 2668.6490964531. The cubic root of 7121688 is about 192.3952361866.

The spelling of 7121688 in words is "seven million, one hundred twenty-one thousand, six hundred eighty-eight".