6540987 has 4 divisors (see below), whose sum is σ = 8721320. Its totient is φ = 4360656.

The previous prime is 6540983. The next prime is 6541021. The reversal of 6540987 is 7890456.

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

It is not a de Polignac number, because 6540987 - 2² = 6540983 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6540983) 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, 1090162 + ... + 1090167.

It is an arithmetic number, because the mean of its divisors is an integer number (2180330).

Almost surely, 2^6540987 is an apocalyptic number.

6540987 is a deficient number, since it is larger than the sum of its proper divisors (2180333).

6540987 is a wasteful number, since it uses less digits than its factorization.

6540987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2180332.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 6540987 is about 2557.5353369993. The cubic root of 6540987 is about 187.0170039920.

The spelling of 6540987 in words is "six million, five hundred forty thousand, nine hundred eighty-seven".