647429 has 2 divisors, whose sum is σ = 647430. Its totient is φ = 647428.

The previous prime is 647417. The next prime is 647441. The reversal of 647429 is 924746.

It is a balanced prime because it is at equal distance from previous prime (647417) and next prime (647441).

It can be written as a sum of positive squares in only one way, i.e., 643204 + 4225 = 802^2 + 65^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647429 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 647395 and 647404.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647429.

It is not a weakly prime, because it can be changed into another prime (647489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323714 + 323715.

It is an arithmetic number, because the mean of its divisors is an integer number (323715).

2⁶⁴⁷⁴²⁹ is an apocalyptic number.

It is an amenable number.

647429 is a deficient number, since it is larger than the sum of its proper divisors (1).

647429 is an equidigital number, since it uses as much as digits as its factorization.

647429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 647429 is about 804.6297285087. The cubic root of 647429 is about 86.5095493261.

The spelling of 647429 in words is "six hundred forty-seven thousand, four hundred twenty-nine".