129440939 has 8 divisors (see below), whose sum is σ = 136403280. Its totient is φ = 122493600.

The previous prime is 129440933. The next prime is 129440953. The reversal of 129440939 is 939044921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129440939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129440896 and 129440905.

It is not an unprimeable number, because it can be changed into a prime (129440933) 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 7 ways as a sum of consecutive naturals, for example, 16949 + ... + 23369.

It is an arithmetic number, because the mean of its divisors is an integer number (17050410).

Almost surely, 2^129440939 is an apocalyptic number.

129440939 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

129440939 is a deficient number, since it is larger than the sum of its proper divisors (6962341).

129440939 is a wasteful number, since it uses less digits than its factorization.

129440939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7501.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 129440939 is about 11377.2113894399. The cubic root of 129440939 is about 505.8524816419.

The spelling of 129440939 in words is "one hundred twenty-nine million, four hundred forty thousand, nine hundred thirty-nine".