129744520 has 16 divisors (see below), whose sum is σ = 291925260. Its totient is φ = 51897792.

The previous prime is 129744509. The next prime is 129744523. The reversal of 129744520 is 25447921.

It can be written as a sum of positive squares in 2 ways, for example, as 107785924 + 21958596 = 10382^2 + 4686^2 .

It is not an unprimeable number, because it can be changed into a prime (129744523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1621767 + ... + 1621846.

Almost surely, 2^129744520 is an apocalyptic number.

129744520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129744520 is an abundant number, since it is smaller than the sum of its proper divisors (162180740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129744520 is a wasteful number, since it uses less digits than its factorization.

129744520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243624 (or 3243620 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 129744520 is about 11390.5452020524. The cubic root of 129744520 is about 506.2476356136.

The spelling of 129744520 in words is "one hundred twenty-nine million, seven hundred forty-four thousand, five hundred twenty".