6921642 has 48 divisors (see below), whose sum is σ = 17351712. Its totient is φ = 1824480.

The previous prime is 6921637. The next prime is 6921653. The reversal of 6921642 is 2461296.

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, 2917 + ... + 4727.

It is an arithmetic number, because the mean of its divisors is an integer number (361494).

Almost surely, 2^6921642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6921642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8675856).

6921642 is an abundant number, since it is smaller than the sum of its proper divisors (10430070).

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

6921642 is a wasteful number, since it uses less digits than its factorization.

6921642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843 (or 1836 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 6921642 is about 2630.9013664522. The cubic root of 6921642 is about 190.5766598558.

The spelling of 6921642 in words is "six million, nine hundred twenty-one thousand, six hundred forty-two".