129138441 has 8 divisors (see below), whose sum is σ = 172615584. Its totient is φ = 85876800.

The previous prime is 129138439. The next prime is 129138461. The reversal of 129138441 is 144831921.

It is a happy number.

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

It is not a de Polignac number, because 129138441 - 2¹ = 129138439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129138461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52471 + ... + 54876.

It is an arithmetic number, because the mean of its divisors is an integer number (21576948).

Almost surely, 2^129138441 is an apocalyptic number.

It is an amenable number.

129138441 is a deficient number, since it is larger than the sum of its proper divisors (43477143).

129138441 is a wasteful number, since it uses less digits than its factorization.

129138441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107751.

The product of its digits is 6912, while the sum is 33.

The square root of 129138441 is about 11363.9095825336. The cubic root of 129138441 is about 505.4581223300.

The spelling of 129138441 in words is "one hundred twenty-nine million, one hundred thirty-eight thousand, four hundred forty-one".