864629 has 2 divisors, whose sum is σ = 864630. Its totient is φ = 864628.

The previous prime is 864623. The next prime is 864631. The reversal of 864629 is 926468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 722500 + 142129 = 850^2 + 377^2 .

It is a cyclic number.

It is not a de Polignac number, because 864629 - 2⁴ = 864613 is a prime.

Together with 864631, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432314 + 432315.

It is an arithmetic number, because the mean of its divisors is an integer number (432315).

2⁸⁶⁴⁶²⁹ is an apocalyptic number.

It is an amenable number.

864629 is a deficient number, since it is larger than the sum of its proper divisors (1).

864629 is an equidigital number, since it uses as much as digits as its factorization.

864629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 35.

The square root of 864629 is about 929.8542896605. The cubic root of 864629 is about 95.2671703648.

The spelling of 864629 in words is "eight hundred sixty-four thousand, six hundred twenty-nine".