647246243 has 12 divisors (see below), whose sum is σ = 785656080. Its totient is φ = 530660592.

The previous prime is 647246239. The next prime is 647246263. The reversal of 647246243 is 342642746.

It is not a de Polignac number, because 647246243 - 2² = 647246239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 647246197 and 647246206.

It is not an unprimeable number, because it can be changed into a prime (647246203) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 286028 + ... + 288281.

It is an arithmetic number, because the mean of its divisors is an integer number (65471340).

Almost surely, 2^647246243 is an apocalyptic number.

647246243 is a deficient number, since it is larger than the sum of its proper divisors (138409837).

647246243 is a wasteful number, since it uses less digits than its factorization.

647246243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574346 (or 574339 counting only the distinct ones).

The product of its digits is 193536, while the sum is 38.

The square root of 647246243 is about 25441.0346291184. The cubic root of 647246243 is about 865.0140855514.

Adding to 647246243 its reverse (342642746), we get a palindrome (989888989).

The spelling of 647246243 in words is "six hundred forty-seven million, two hundred forty-six thousand, two hundred forty-three".