6749421 has 16 divisors (see below), whose sum is σ = 10326528. Its totient is φ = 3841200.

The previous prime is 6749411. The next prime is 6749437. The reversal of 6749421 is 1249476.

It is a happy number.

It is not a de Polignac number, because 6749421 - 2⁷ = 6749293 is a prime.

6749421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6749401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6466 + ... + 7436.

It is an arithmetic number, because the mean of its divisors is an integer number (645408).

Almost surely, 2^6749421 is an apocalyptic number.

It is an amenable number.

6749421 is a deficient number, since it is larger than the sum of its proper divisors (3577107).

6749421 is a wasteful number, since it uses less digits than its factorization.

6749421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312.

The product of its digits is 12096, while the sum is 33.

The square root of 6749421 is about 2597.9647803617. The cubic root of 6749421 is about 188.9827536683.

Subtracting from 6749421 its reverse (1249476), we obtain a palindrome (5499945).

The spelling of 6749421 in words is "six million, seven hundred forty-nine thousand, four hundred twenty-one".