629689 has 2 divisors, whose sum is σ = 629690. Its totient is φ = 629688.

The previous prime is 629687. The next prime is 629701. The reversal of 629689 is 986926.

It is a happy number.

629689 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 514089 + 115600 = 717^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 629689 - 2¹ = 629687 is a prime.

Together with 629687, it forms a pair of twin primes.

It is an Ulam number.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (629683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314844 + 314845.

It is an arithmetic number, because the mean of its divisors is an integer number (314845).

2⁶²⁹⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

629689 is a deficient number, since it is larger than the sum of its proper divisors (1).

629689 is an equidigital number, since it uses as much as digits as its factorization.

629689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 629689 is about 793.5294575503. The cubic root of 629689 is about 85.7120802343.

The spelling of 629689 in words is "six hundred twenty-nine thousand, six hundred eighty-nine".