6398987 has 8 divisors (see below), whose sum is σ = 7743456. Its totient is φ = 5162112.

The previous prime is 6398983. The next prime is 6398999. The reversal of 6398987 is 7898936.

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 6398987 - 2² = 6398983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6398981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26768 + ... + 27005.

It is an arithmetic number, because the mean of its divisors is an integer number (967932).

Almost surely, 2^6398987 is an apocalyptic number.

6398987 is a deficient number, since it is larger than the sum of its proper divisors (1344469).

6398987 is a wasteful number, since it uses less digits than its factorization.

6398987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53797.

The product of its digits is 653184, while the sum is 50.

The square root of 6398987 is about 2529.6219085073. The cubic root of 6398987 is about 185.6537571412.

The spelling of 6398987 in words is "six million, three hundred ninety-eight thousand, nine hundred eighty-seven".