129789639 has 24 divisors (see below), whose sum is σ = 217774752. Its totient is φ = 72947520.

The previous prime is 129789619. The next prime is 129789659. The reversal of 129789639 is 936987921.

It is an interprime number because it is at equal distance from previous prime (129789619) and next prime (129789659).

It is not a de Polignac number, because 129789639 - 2⁷ = 129789511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129789619) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13044 + ... + 20729.

It is an arithmetic number, because the mean of its divisors is an integer number (9073948).

Almost surely, 2^129789639 is an apocalyptic number.

129789639 is a deficient number, since it is larger than the sum of its proper divisors (87985113).

129789639 is a wasteful number, since it uses less digits than its factorization.

129789639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33847 (or 33844 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The square root of 129789639 is about 11392.5255760082. The cubic root of 129789639 is about 506.3063117973.

The spelling of 129789639 in words is "one hundred twenty-nine million, seven hundred eighty-nine thousand, six hundred thirty-nine".