405646239247 has 2 divisors, whose sum is σ = 405646239248. Its totient is φ = 405646239246.

The previous prime is 405646239077. The next prime is 405646239277. The reversal of 405646239247 is 742932646504.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405646239247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 405646239194 and 405646239203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405646239277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202823119623 + 202823119624.

It is an arithmetic number, because the mean of its divisors is an integer number (202823119624).

Almost surely, 2^405646239247 is an apocalyptic number.

405646239247 is a deficient number, since it is larger than the sum of its proper divisors (1).

405646239247 is an equidigital number, since it uses as much as digits as its factorization.

405646239247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8709120, while the sum is 52.

The spelling of 405646239247 in words is "four hundred five billion, six hundred forty-six million, two hundred thirty-nine thousand, two hundred forty-seven".