647006839 has 2 divisors, whose sum is σ = 647006840. Its totient is φ = 647006838.

The previous prime is 647006837. The next prime is 647006861. The reversal of 647006839 is 938600746.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647006839 - 2¹ = 647006837 is a prime.

Together with 647006837, it forms a pair of twin primes.

It is equal to p_33645796 and since 647006839 and 33645796 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 647006795 and 647006804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647006837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323503419 + 323503420.

It is an arithmetic number, because the mean of its divisors is an integer number (323503420).

Almost surely, 2^647006839 is an apocalyptic number.

647006839 is a deficient number, since it is larger than the sum of its proper divisors (1).

647006839 is an equidigital number, since it uses as much as digits as its factorization.

647006839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 647006839 is about 25436.3291180154. The cubic root of 647006839 is about 864.9074216801.

The spelling of 647006839 in words is "six hundred forty-seven million, six thousand, eight hundred thirty-nine".