6921140 has 24 divisors (see below), whose sum is σ = 15036840. Its totient is φ = 2672768.

The previous prime is 6921139. The next prime is 6921157. The reversal of 6921140 is 411296.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1731856 + 5189284 = 1316^2 + 2278^2 .

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 7 ways as a sum of consecutive naturals, for example, 5387 + ... + 6546.

It is an arithmetic number, because the mean of its divisors is an integer number (626535).

Almost surely, 2^6921140 is an apocalyptic number.

It is an amenable number.

6921140 is an abundant number, since it is smaller than the sum of its proper divisors (8115700).

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

6921140 is a wasteful number, since it uses less digits than its factorization.

6921140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11971 (or 11969 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 6921140 is about 2630.8059601575. The cubic root of 6921140 is about 190.5720524810.

The spelling of 6921140 in words is "six million, nine hundred twenty-one thousand, one hundred forty".