6398581 has 8 divisors (see below), whose sum is σ = 7341824. Its totient is φ = 5462640.

The previous prime is 6398569. The next prime is 6398593. The reversal of 6398581 is 1858936.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6398569) and next prime (6398593).

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 6398581 - 2⁷ = 6398453 is a prime.

It is a super-2 number, since 2×6398581² = 81883677627122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6398551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211 + ... + 3583.

It is an arithmetic number, because the mean of its divisors is an integer number (917728).

Almost surely, 2^6398581 is an apocalyptic number.

It is an amenable number.

6398581 is a deficient number, since it is larger than the sum of its proper divisors (943243).

6398581 is a wasteful number, since it uses less digits than its factorization.

6398581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3651.

The product of its digits is 51840, while the sum is 40.

The square root of 6398581 is about 2529.5416580875. The cubic root of 6398581 is about 185.6498306333.

The spelling of 6398581 in words is "six million, three hundred ninety-eight thousand, five hundred eighty-one".