629439989 has 4 divisors (see below), whose sum is σ = 632917740. Its totient is φ = 625962240.

The previous prime is 629439973. The next prime is 629440003. The reversal of 629439989 is 989934926.

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 2788900 + 626651089 = 1670^2 + 25033^2 .

It is a cyclic number.

It is not a de Polignac number, because 629439989 - 2⁴ = 629439973 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 (629439929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1738604 + ... + 1738965.

It is an arithmetic number, because the mean of its divisors is an integer number (158229435).

Almost surely, 2^629439989 is an apocalyptic number.

It is an amenable number.

629439989 is a deficient number, since it is larger than the sum of its proper divisors (3477751).

629439989 is a wasteful number, since it uses less digits than its factorization.

629439989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3477750.

The product of its digits is 7558272, while the sum is 59.

The square root of 629439989 is about 25088.6426296841. The cubic root of 629439989 is about 857.0078044191.

The spelling of 629439989 in words is "six hundred twenty-nine million, four hundred thirty-nine thousand, nine hundred eighty-nine".