6441987 has 4 divisors (see below), whose sum is σ = 8589320. Its totient is φ = 4294656.

The previous prime is 6441977. The next prime is 6441989. The reversal of 6441987 is 7891446.

It is a happy number.

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

It is not a de Polignac number, because 6441987 - 2⁷ = 6441859 is a prime.

It is a D-number.

It is a Duffinian number.

6441987 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6441989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073662 + ... + 1073667.

It is an arithmetic number, because the mean of its divisors is an integer number (2147330).

Almost surely, 2^6441987 is an apocalyptic number.

6441987 is a deficient number, since it is larger than the sum of its proper divisors (2147333).

6441987 is a wasteful number, since it uses less digits than its factorization.

6441987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2147332.

The product of its digits is 48384, while the sum is 39.

The square root of 6441987 is about 2538.1069717409. The cubic root of 6441987 is about 186.0686820005.

The spelling of 6441987 in words is "six million, four hundred forty-one thousand, nine hundred eighty-seven".