6556739 has 6 divisors (see below), whose sum is σ = 7627284. Its totient is φ = 5620020.

The previous prime is 6556727. The next prime is 6556741. The reversal of 6556739 is 9376556.

It is not a de Polignac number, because 6556739 - 2⁴ = 6556723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6556696 and 6556705.

It is not an unprimeable number, because it can be changed into a prime (6556709) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66857 + ... + 66954.

It is an arithmetic number, because the mean of its divisors is an integer number (1271214).

Almost surely, 2^6556739 is an apocalyptic number.

6556739 is a deficient number, since it is larger than the sum of its proper divisors (1070545).

6556739 is a wasteful number, since it uses less digits than its factorization.

6556739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133825 (or 133818 counting only the distinct ones).

The product of its digits is 170100, while the sum is 41.

The square root of 6556739 is about 2560.6130125421. The cubic root of 6556739 is about 187.1670083793.

The spelling of 6556739 in words is "six million, five hundred fifty-six thousand, seven hundred thirty-nine".