629917 has 4 divisors (see below), whose sum is σ = 638620. Its totient is φ = 621216.

The previous prime is 629903. The next prime is 629921. The reversal of 629917 is 719926.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 423801 + 206116 = 651^2 + 454^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-629917 is a prime.

It is a Duffinian number.

629917 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (629927) 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 in 3 ways as a sum of consecutive naturals, for example, 4242 + ... + 4387.

It is an arithmetic number, because the mean of its divisors is an integer number (159655).

2⁶²⁹⁹¹⁷ is an apocalyptic number.

It is an amenable number.

629917 is a deficient number, since it is larger than the sum of its proper divisors (8703).

629917 is an equidigital number, since it uses as much as digits as its factorization.

629917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8702.

The product of its digits is 6804, while the sum is 34.

The square root of 629917 is about 793.6731065117. The cubic root of 629917 is about 85.7224239627.

Subtracting 629917 from its reverse (719926), we obtain a palindrome (90009).

The spelling of 629917 in words is "six hundred twenty-nine thousand, nine hundred seventeen".