6539972 has 12 divisors (see below), whose sum is σ = 11754540. Its totient is φ = 3181536.

The previous prime is 6539963. The next prime is 6539983. The reversal of 6539972 is 2799356.

It can be written as a sum of positive squares in 2 ways, for example, as 2483776 + 4056196 = 1576^2 + 2014^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21947 + ... + 22242.

It is an arithmetic number, because the mean of its divisors is an integer number (979545).

Almost surely, 2^6539972 is an apocalyptic number.

It is an amenable number.

6539972 is a deficient number, since it is larger than the sum of its proper divisors (5214568).

6539972 is a wasteful number, since it uses less digits than its factorization.

6539972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44230 (or 44228 counting only the distinct ones).

The product of its digits is 102060, while the sum is 41.

The square root of 6539972 is about 2557.3368960698. The cubic root of 6539972 is about 187.0073300148.

The spelling of 6539972 in words is "six million, five hundred thirty-nine thousand, nine hundred seventy-two".