6787421 has 8 divisors (see below), whose sum is σ = 7186080. Its totient is φ = 6399792.

The previous prime is 6787399. The next prime is 6787439. The reversal of 6787421 is 1247876.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6787421 - 2²² = 2593117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6787441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1475 + ... + 3968.

It is an arithmetic number, because the mean of its divisors is an integer number (898260).

Almost surely, 2^6787421 is an apocalyptic number.

It is an amenable number.

6787421 is a deficient number, since it is larger than the sum of its proper divisors (398659).

6787421 is a wasteful number, since it uses less digits than its factorization.

6787421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5515.

The product of its digits is 18816, while the sum is 35.

The square root of 6787421 is about 2605.2679324783. The cubic root of 6787421 is about 189.3367548672.

The spelling of 6787421 in words is "six million, seven hundred eighty-seven thousand, four hundred twenty-one".