129638859 has 12 divisors (see below), whose sum is σ = 201072744. Its totient is φ = 74079264.

The previous prime is 129638857. The next prime is 129638863. The reversal of 129638859 is 958836921.

It is a happy number.

It is not a de Polignac number, because 129638859 - 2¹ = 129638857 is a prime.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (129638857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 440802 + ... + 441095.

It is an arithmetic number, because the mean of its divisors is an integer number (16756062).

Almost surely, 2^129638859 is an apocalyptic number.

129638859 is a deficient number, since it is larger than the sum of its proper divisors (71433885).

129638859 is an equidigital number, since it uses as much as digits as its factorization.

129638859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881914 (or 881907 counting only the distinct ones).

The product of its digits is 933120, while the sum is 51.

The square root of 129638859 is about 11385.9061562969. The cubic root of 129638859 is about 506.1101727532.

The spelling of 129638859 in words is "one hundred twenty-nine million, six hundred thirty-eight thousand, eight hundred fifty-nine".