129439643 has 4 divisors (see below), whose sum is σ = 129498960. Its totient is φ = 129380328.

The previous prime is 129439637. The next prime is 129439657. The reversal of 129439643 is 346934921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346934921 = 23 ⋅15084127.

It is a cyclic number.

It is not a de Polignac number, because 129439643 - 2¹⁰ = 129438619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129439643.

It is not an unprimeable number, because it can be changed into a prime (129439693) 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, 26255 + ... + 30792.

It is an arithmetic number, because the mean of its divisors is an integer number (32374740).

Almost surely, 2^129439643 is an apocalyptic number.

129439643 is a deficient number, since it is larger than the sum of its proper divisors (59317).

129439643 is an equidigital number, since it uses as much as digits as its factorization.

129439643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59316.

The product of its digits is 139968, while the sum is 41.

The square root of 129439643 is about 11377.1544333370. The cubic root of 129439643 is about 505.8507933893.

The spelling of 129439643 in words is "one hundred twenty-nine million, four hundred thirty-nine thousand, six hundred forty-three".