6721938 has 24 divisors (see below), whose sum is σ = 14959308. Its totient is φ = 2179872.

The previous prime is 6721927. The next prime is 6721943. The reversal of 6721938 is 8391276.

It can be written as a sum of positive squares in 2 ways, for example, as 6365529 + 356409 = 2523^2 + 597^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4381 + ... + 5712.

Almost surely, 2^6721938 is an apocalyptic number.

6721938 is an abundant number, since it is smaller than the sum of its proper divisors (8237370).

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

6721938 is a wasteful number, since it uses less digits than its factorization.

6721938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10138 (or 10135 counting only the distinct ones).

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

The square root of 6721938 is about 2592.6700522820. The cubic root of 6721938 is about 188.7258981257.

The spelling of 6721938 in words is "six million, seven hundred twenty-one thousand, nine hundred thirty-eight".