6387985 has 4 divisors (see below), whose sum is σ = 7665588. Its totient is φ = 5110384.

The previous prime is 6387977. The next prime is 6388021. The reversal of 6387985 is 5897836.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1648656 + 4739329 = 1284^2 + 2177^2 .

It is a cyclic number.

It is not a de Polignac number, because 6387985 - 2³ = 6387977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 638794 + ... + 638803.

It is an arithmetic number, because the mean of its divisors is an integer number (1916397).

Almost surely, 2^6387985 is an apocalyptic number.

It is an amenable number.

6387985 is a deficient number, since it is larger than the sum of its proper divisors (1277603).

6387985 is a wasteful number, since it uses less digits than its factorization.

6387985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277602.

The product of its digits is 362880, while the sum is 46.

The square root of 6387985 is about 2527.4463396876. The cubic root of 6387985 is about 185.5472957918.

The spelling of 6387985 in words is "six million, three hundred eighty-seven thousand, nine hundred eighty-five".