6438987 has 8 divisors (see below), whose sum is σ = 9539280. Its totient is φ = 4292640.

The previous prime is 6438983. The next prime is 6438997. The reversal of 6438987 is 7898346.

It is a happy number.

It is not a de Polignac number, because 6438987 - 2² = 6438983 is a prime.

It is a d-powerful number, because it can be written as 6⁸ + 4¹¹ + 3 + 8³ + 9⁶ + 8⁵ + 7³ .

It is not an unprimeable number, because it can be changed into a prime (6438983) 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, 119214 + ... + 119267.

It is an arithmetic number, because the mean of its divisors is an integer number (1192410).

Almost surely, 2^6438987 is an apocalyptic number.

6438987 is a deficient number, since it is larger than the sum of its proper divisors (3100293).

6438987 is a wasteful number, since it uses less digits than its factorization.

6438987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238490 (or 238484 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 6438987 is about 2537.5159112802. The cubic root of 6438987 is about 186.0397937750.

The spelling of 6438987 in words is "six million, four hundred thirty-eight thousand, nine hundred eighty-seven".