622729 has 2 divisors, whose sum is σ = 622730. Its totient is φ = 622728.

The previous prime is 622723. The next prime is 622751. The reversal of 622729 is 927226.

622729 is nontrivially palindromic in base 16.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518400 + 104329 = 720^2 + 323^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-622729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 622697 and 622706.

It is not a weakly prime, because it can be changed into another prime (622723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311364 + 311365.

It is an arithmetic number, because the mean of its divisors is an integer number (311365).

2⁶²²⁷²⁹ is an apocalyptic number.

It is an amenable number.

622729 is a deficient number, since it is larger than the sum of its proper divisors (1).

622729 is an equidigital number, since it uses as much as digits as its factorization.

622729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 28.

The square root of 622729 is about 789.1318014122. The cubic root of 622729 is about 85.3951155095.

The spelling of 622729 in words is "six hundred twenty-two thousand, seven hundred twenty-nine".