7121880 has 96 divisors (see below), whose sum is σ = 23549760. Its totient is φ = 1866240.

The previous prime is 7121879. The next prime is 7121921. The reversal of 7121880 is 881217.

7121880 = T₈₀ + T₈₁ + ... + T₃₅₀.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26145 + ... + 26415.

It is an arithmetic number, because the mean of its divisors is an integer number (245310).

Almost surely, 2^7121880 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 7121880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11774880).

7121880 is an abundant number, since it is smaller than the sum of its proper divisors (16427880).

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

7121880 is a wasteful number, since it uses less digits than its factorization.

7121880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 7121880 is about 2668.6850694677. The cubic root of 7121880 is about 192.3969651566.

It can be divided in two parts, 7121 and 880, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 7121880 in words is "seven million, one hundred twenty-one thousand, eight hundred eighty".