129744436 has 6 divisors (see below), whose sum is σ = 227052770. Its totient is φ = 64872216.

The previous prime is 129744431. The next prime is 129744437. The reversal of 129744436 is 634447921.

It can be written as a sum of positive squares in only one way, i.e., 92044836 + 37699600 = 9594^2 + 6140^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129744431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16218051 + ... + 16218058.

Almost surely, 2^129744436 is an apocalyptic number.

It is an amenable number.

129744436 is a deficient number, since it is larger than the sum of its proper divisors (97308334).

129744436 is a wasteful number, since it uses less digits than its factorization.

129744436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32436113 (or 32436111 counting only the distinct ones).

The product of its digits is 145152, while the sum is 40.

The square root of 129744436 is about 11390.5415147832. The cubic root of 129744436 is about 506.2475263609.

The spelling of 129744436 in words is "one hundred twenty-nine million, seven hundred forty-four thousand, four hundred thirty-six".