129339389 has 4 divisors (see below), whose sum is σ = 129627900. Its totient is φ = 129050880.

The previous prime is 129339377. The next prime is 129339421. The reversal of 129339389 is 983933921.

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 68343289 + 60996100 = 8267^2 + 7810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129339389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129339319) 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, 143582 + ... + 144479.

It is an arithmetic number, because the mean of its divisors is an integer number (32406975).

Almost surely, 2^129339389 is an apocalyptic number.

It is an amenable number.

129339389 is a deficient number, since it is larger than the sum of its proper divisors (288511).

129339389 is an equidigital number, since it uses as much as digits as its factorization.

129339389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288510.

The product of its digits is 314928, while the sum is 47.

The square root of 129339389 is about 11372.7476451384. The cubic root of 129339389 is about 505.7201619412.

It can be divided in two parts, 12933 and 9389, that added together give a palindrome (22322).

The spelling of 129339389 in words is "one hundred twenty-nine million, three hundred thirty-nine thousand, three hundred eighty-nine".