6540989 has 8 divisors (see below), whose sum is σ = 8050560. Its totient is φ = 5175216.

The previous prime is 6540983. The next prime is 6541021. The reversal of 6540989 is 9890456.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6540989 - 2²⁰ = 5492413 is a prime.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 35849 + ... + 36030.

It is an arithmetic number, because the mean of its divisors is an integer number (1006320).

Almost surely, 2^6540989 is an apocalyptic number.

It is an amenable number.

6540989 is a deficient number, since it is larger than the sum of its proper divisors (1509571).

6540989 is a wasteful number, since it uses less digits than its factorization.

6540989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71899.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 6540989 is about 2557.5357280007. The cubic root of 6540989 is about 187.0170230530.

The spelling of 6540989 in words is "six million, five hundred forty thousand, nine hundred eighty-nine".