129429039 has 4 divisors (see below), whose sum is σ = 172572056. Its totient is φ = 86286024.

The previous prime is 129429037. The next prime is 129429043. The reversal of 129429039 is 930924921.

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

It is not a de Polignac number, because 129429039 - 2¹ = 129429037 is a prime.

It is a super-2 number, since 2×129429039² = 33503752272927042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129428988 and 129429006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129429031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21571504 + ... + 21571509.

It is an arithmetic number, because the mean of its divisors is an integer number (43143014).

Almost surely, 2^129429039 is an apocalyptic number.

129429039 is a deficient number, since it is larger than the sum of its proper divisors (43143017).

129429039 is an equidigital number, since it uses as much as digits as its factorization.

129429039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43143016.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 129429039 is about 11376.6884021670. The cubic root of 129429039 is about 505.8369795165.

The spelling of 129429039 in words is "one hundred twenty-nine million, four hundred twenty-nine thousand, thirty-nine".