629259989 has 4 divisors (see below), whose sum is σ = 630215520. Its totient is φ = 628304460.

The previous prime is 629259977. The next prime is 629260019. The reversal of 629259989 is 989952926.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 989952926 = 2 ⋅494976463.

It is a cyclic number.

It is not a de Polignac number, because 629259989 - 2²⁸ = 360824533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (629259919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476777 + ... + 478094.

It is an arithmetic number, because the mean of its divisors is an integer number (157553880).

Almost surely, 2^629259989 is an apocalyptic number.

It is an amenable number.

629259989 is a deficient number, since it is larger than the sum of its proper divisors (955531).

629259989 is an equidigital number, since it uses as much as digits as its factorization.

629259989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955530.

The product of its digits is 6298560, while the sum is 59.

The square root of 629259989 is about 25085.0550926244. The cubic root of 629259989 is about 856.9261042229.

The spelling of 629259989 in words is "six hundred twenty-nine million, two hundred fifty-nine thousand, nine hundred eighty-nine".