129260639 has 4 divisors (see below), whose sum is σ = 136864224. Its totient is φ = 121657056.

The previous prime is 129260633. The next prime is 129260641. The reversal of 129260639 is 936062921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129260639 - 2¹⁶ = 129195103 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 (129260633) 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, 3801767 + ... + 3801800.

It is an arithmetic number, because the mean of its divisors is an integer number (34216056).

Almost surely, 2^129260639 is an apocalyptic number.

129260639 is a deficient number, since it is larger than the sum of its proper divisors (7603585).

129260639 is an equidigital number, since it uses as much as digits as its factorization.

129260639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7603584.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 129260639 is about 11369.2848939588. The cubic root of 129260639 is about 505.6175029638.

The spelling of 129260639 in words is "one hundred twenty-nine million, two hundred sixty thousand, six hundred thirty-nine".