647493239 has 2 divisors, whose sum is σ = 647493240. Its totient is φ = 647493238.

The previous prime is 647493227. The next prime is 647493271. The reversal of 647493239 is 932394746.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647493239 is a prime.

It is a super-2 number, since 2×647493239² = 838494989101422242, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 647493193 and 647493202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647493839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323746619 + 323746620.

It is an arithmetic number, because the mean of its divisors is an integer number (323746620).

Almost surely, 2^647493239 is an apocalyptic number.

647493239 is a deficient number, since it is larger than the sum of its proper divisors (1).

647493239 is an equidigital number, since it uses as much as digits as its factorization.

647493239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 47.

The square root of 647493239 is about 25445.8884498066. Note that the first 3 decimals coincide. The cubic root of 647493239 is about 865.1241043938.

The spelling of 647493239 in words is "six hundred forty-seven million, four hundred ninety-three thousand, two hundred thirty-nine".