6921738 has 48 divisors (see below), whose sum is σ = 16242720. Its totient is φ = 2122848.

The previous prime is 6921727. The next prime is 6921763. The reversal of 6921738 is 8371296.

It is a d-powerful number, because it can be written as 6⁵ + 9³ + 2²¹ + 1 + 7³ + 3¹⁴ + 8⁵ .

It is a Curzon number.

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 23 ways as a sum of consecutive naturals, for example, 12381 + ... + 12927.

It is an arithmetic number, because the mean of its divisors is an integer number (338390).

Almost surely, 2^6921738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6921738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8121360).

6921738 is an abundant number, since it is smaller than the sum of its proper divisors (9320982).

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

6921738 is a wasteful number, since it uses less digits than its factorization.

6921738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611 (or 608 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 6921738 is about 2630.9196110866. The cubic root of 6921738 is about 190.5775409220.

The spelling of 6921738 in words is "six million, nine hundred twenty-one thousand, seven hundred thirty-eight".