129372436 has 6 divisors (see below), whose sum is σ = 226401770. Its totient is φ = 64686216.

The previous prime is 129372433. The next prime is 129372449. The reversal of 129372436 is 634273921.

It can be written as a sum of positive squares in only one way, i.e., 112232836 + 17139600 = 10594^2 + 4140^2 .

It is a junction number, because it is equal to n+sod(n) for n = 129372395 and 129372404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129372433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16171551 + ... + 16171558.

Almost surely, 2^129372436 is an apocalyptic number.

It is an amenable number.

129372436 is a deficient number, since it is larger than the sum of its proper divisors (97029334).

129372436 is a wasteful number, since it uses less digits than its factorization.

129372436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32343113 (or 32343111 counting only the distinct ones).

The product of its digits is 54432, while the sum is 37.

The square root of 129372436 is about 11374.2004554166. The cubic root of 129372436 is about 505.7632297984.

The spelling of 129372436 in words is "one hundred twenty-nine million, three hundred seventy-two thousand, four hundred thirty-six".