6421836 has 48 divisors (see below), whose sum is σ = 15776768. Its totient is φ = 2030400.

The previous prime is 6421817. The next prime is 6421841. The reversal of 6421836 is 6381246.

It is a super-2 number, since 2×6421836² = 82479955221792, which contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 22551 + ... + 22833.

Almost surely, 2^6421836 is an apocalyptic number.

It is an amenable number.

6421836 is an abundant number, since it is smaller than the sum of its proper divisors (9354932).

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

6421836 is a wasteful number, since it uses less digits than its factorization.

6421836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 380 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 6421836 is about 2534.1341716649. The cubic root of 6421836 is about 185.8744672674.

The spelling of 6421836 in words is "six million, four hundred twenty-one thousand, eight hundred thirty-six".