6749021 has 4 divisors (see below), whose sum is σ = 6756444. Its totient is φ = 6741600.

The previous prime is 6749003. The next prime is 6749027. The reversal of 6749021 is 1209476.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3024121 + 3724900 = 1739^2 + 1930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6749021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6749027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2120 + ... + 4241.

It is an arithmetic number, because the mean of its divisors is an integer number (1689111).

It is a Poulet number, since it divides 2^6749020-1.

Almost surely, 2^6749021 is an apocalyptic number.

It is an amenable number.

6749021 is a deficient number, since it is larger than the sum of its proper divisors (7423).

6749021 is a wasteful number, since it uses less digits than its factorization.

6749021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7422.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 6749021 is about 2597.8877958834. The cubic root of 6749021 is about 188.9790202817.

The spelling of 6749021 in words is "six million, seven hundred forty-nine thousand, twenty-one".