129155936 has 96 divisors (see below), whose sum is σ = 331490880. Its totient is φ = 48070656.

The previous prime is 129155933. The next prime is 129155941. The reversal of 129155936 is 639551921.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 129155893 and 129155902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129155933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48200 + ... + 50808.

It is an arithmetic number, because the mean of its divisors is an integer number (3453030).

Almost surely, 2^129155936 is an apocalyptic number.

129155936 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 129155936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165745440).

129155936 is an abundant number, since it is smaller than the sum of its proper divisors (202334944).

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

129155936 is a wasteful number, since it uses less digits than its factorization.

129155936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2656 (or 2648 counting only the distinct ones).

The product of its digits is 72900, while the sum is 41.

The square root of 129155936 is about 11364.6793179570. The cubic root of 129155936 is about 505.4809469061.

The spelling of 129155936 in words is "one hundred twenty-nine million, one hundred fifty-five thousand, nine hundred thirty-six".