129673424 has 20 divisors (see below), whose sum is σ = 252292260. Its totient is φ = 64565760.

The previous prime is 129673417. The next prime is 129673451. The reversal of 129673424 is 424376921.

It can be written as a sum of positive squares in 2 ways, for example, as 59783824 + 69889600 = 7732^2 + 8360^2 .

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12959 + ... + 20670.

It is an arithmetic number, because the mean of its divisors is an integer number (12614613).

Almost surely, 2^129673424 is an apocalyptic number.

It is an amenable number.

129673424 is a deficient number, since it is larger than the sum of its proper divisors (122618836).

129673424 is a wasteful number, since it uses less digits than its factorization.

129673424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33878 (or 33872 counting only the distinct ones).

The product of its digits is 72576, while the sum is 38.

The square root of 129673424 is about 11387.4239404705. The cubic root of 129673424 is about 506.1551493488.

The spelling of 129673424 in words is "one hundred twenty-nine million, six hundred seventy-three thousand, four hundred twenty-four".