129447936 has 96 divisors (see below), whose sum is σ = 383619600. Its totient is φ = 43130880.

The previous prime is 129447869. The next prime is 129447949. The reversal of 129447936 is 639744921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 129447891 and 129447900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54126 + ... + 56466.

Almost surely, 2^129447936 is an apocalyptic number.

129447936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129447936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191809800).

129447936 is an abundant number, since it is smaller than the sum of its proper divisors (254171664).

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

129447936 is an equidigital number, since it uses as much as digits as its factorization.

129447936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2372 (or 2346 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 129447936 is about 11377.5188859435. The cubic root of 129447936 is about 505.8615961876.

The spelling of 129447936 in words is "one hundred twenty-nine million, four hundred forty-seven thousand, nine hundred thirty-six".