6821738 has 24 divisors (see below), whose sum is σ = 12857376. Its totient is φ = 2657160.

The previous prime is 6821723. The next prime is 6821747. The reversal of 6821738 is 8371286.

It is a super-2 number, since 2×6821738² = 93072218681288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6821698 and 6821707.

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 11 ways as a sum of consecutive naturals, for example, 320 + ... + 3707.

It is an arithmetic number, because the mean of its divisors is an integer number (535724).

Almost surely, 2^6821738 is an apocalyptic number.

6821738 is a deficient number, since it is larger than the sum of its proper divisors (6035638).

6821738 is a wasteful number, since it uses less digits than its factorization.

6821738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4058 (or 4047 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 6821738 is about 2611.8457075409. The cubic root of 6821738 is about 189.6553122758.

The spelling of 6821738 in words is "six million, eight hundred twenty-one thousand, seven hundred thirty-eight".