809629 has 2 divisors, whose sum is σ = 809630. Its totient is φ = 809628.

The previous prime is 809603. The next prime is 809701. The reversal of 809629 is 926908.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 648025 + 161604 = 805^2 + 402^2 .

It is a cyclic number.

It is not a de Polignac number, because 809629 - 2¹⁵ = 776861 is a prime.

It is an Ulam number.

It is a pancake number, because a pancake can be divided into 809629 parts by 1272 straight cuts.

It is a junction number, because it is equal to n+sod(n) for n = 809594 and 809603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809729) 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, 404814 + 404815.

It is an arithmetic number, because the mean of its divisors is an integer number (404815).

2⁸⁰⁹⁶²⁹ is an apocalyptic number.

It is an amenable number.

809629 is a deficient number, since it is larger than the sum of its proper divisors (1).

809629 is an equidigital number, since it uses as much as digits as its factorization.

809629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 809629 is about 899.7938652825. The cubic root of 809629 is about 93.2027411131.

The spelling of 809629 in words is "eight hundred nine thousand, six hundred twenty-nine".