129393439 has 16 divisors (see below), whose sum is σ = 156217600. Its totient is φ = 104696064.

The previous prime is 129393427. The next prime is 129393463. The reversal of 129393439 is 934393921.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 129393439 - 2¹³ = 129385247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129393395 and 129393404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129393419) 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 15 ways as a sum of consecutive naturals, for example, 39247 + ... + 42415.

It is an arithmetic number, because the mean of its divisors is an integer number (9763600).

Almost surely, 2^129393439 is an apocalyptic number.

129393439 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

129393439 is a deficient number, since it is larger than the sum of its proper divisors (26824161).

129393439 is a wasteful number, since it uses less digits than its factorization.

129393439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3502.

The product of its digits is 157464, while the sum is 43.

The square root of 129393439 is about 11375.1236916352. The cubic root of 129393439 is about 505.7905977362.

The spelling of 129393439 in words is "one hundred twenty-nine million, three hundred ninety-three thousand, four hundred thirty-nine".