6547987 has 4 divisors (see below), whose sum is σ = 6707736. Its totient is φ = 6388240.

The previous prime is 6547979. The next prime is 6548023. The reversal of 6547987 is 7897456.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6547987 - 2³ = 6547979 is a prime.

It is a super-2 number, since 2×6547987² = 85752267504338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6547967) 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, 79813 + ... + 79894.

It is an arithmetic number, because the mean of its divisors is an integer number (1676934).

Almost surely, 2^6547987 is an apocalyptic number.

6547987 is a deficient number, since it is larger than the sum of its proper divisors (159749).

6547987 is a wasteful number, since it uses less digits than its factorization.

6547987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159748.

The product of its digits is 423360, while the sum is 46.

The square root of 6547987 is about 2558.9034761007. The cubic root of 6547987 is about 187.0836938412.

The spelling of 6547987 in words is "six million, five hundred forty-seven thousand, nine hundred eighty-seven".