6539994 has 32 divisors (see below), whose sum is σ = 14618880. Its totient is φ = 2167200.

The previous prime is 6539989. The next prime is 6540007. The reversal of 6539994 is 4999356.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14959 + ... + 15389.

It is an arithmetic number, because the mean of its divisors is an integer number (456840).

Almost surely, 2^6539994 is an apocalyptic number.

6539994 is an abundant number, since it is smaller than the sum of its proper divisors (8078886).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6539994 is a wasteful number, since it uses less digits than its factorization.

6539994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723 (or 717 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 6539994 is about 2557.3411974158. The cubic root of 6539994 is about 187.0075397076.

The spelling of 6539994 in words is "six million, five hundred thirty-nine thousand, nine hundred ninety-four".