6387975 has 72 divisors (see below), whose sum is σ = 13057200. Its totient is φ = 2956800.

The previous prime is 6387961. The next prime is 6387977. The reversal of 6387975 is 5797836.

It is a happy number.

6387975 is a `hidden beast` number, since 638 + 7 + 9 + 7 + 5 = 666.

It is not a de Polignac number, because 6387975 - 2⁹ = 6387463 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 6387975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6387977) 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 71 ways as a sum of consecutive naturals, for example, 71731 + ... + 71819.

It is an arithmetic number, because the mean of its divisors is an integer number (181350).

Almost surely, 2^6387975 is an apocalyptic number.

6387975 is an abundant number, since it is smaller than the sum of its proper divisors (6669225).

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

6387975 is a wasteful number, since it uses less digits than its factorization.

6387975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 137 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 6387975 is about 2527.4443614054. Note that the first 3 decimals coincide. The cubic root of 6387975 is about 185.5471989708.

The spelling of 6387975 in words is "six million, three hundred eighty-seven thousand, nine hundred seventy-five".