129646429 has 4 divisors (see below), whose sum is σ = 141432480. Its totient is φ = 117860380.

The previous prime is 129646421. The next prime is 129646459. The reversal of 129646429 is 924646921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 924646921 = 11 ⋅84058811.

It is not a de Polignac number, because 129646429 - 2³ = 129646421 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 (129646421) 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, 5893009 + ... + 5893030.

It is an arithmetic number, because the mean of its divisors is an integer number (35358120).

Almost surely, 2^129646429 is an apocalyptic number.

It is an amenable number.

129646429 is a deficient number, since it is larger than the sum of its proper divisors (11786051).

129646429 is a wasteful number, since it uses less digits than its factorization.

129646429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11786050.

The product of its digits is 186624, while the sum is 43.

The square root of 129646429 is about 11386.2385799701. The cubic root of 129646429 is about 506.1200236561.

It can be divided in two parts, 1296464 and 29, that multiplied together give a triangular number (37597456 = T₈₆₇₁).

The spelling of 129646429 in words is "one hundred twenty-nine million, six hundred forty-six thousand, four hundred twenty-nine".