129088440 has 96 divisors (see below), whose sum is σ = 451825920. Its totient is φ = 31774464.

The previous prime is 129088409. The next prime is 129088447. The reversal of 129088440 is 44880921.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 129088395 and 129088404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129088447) 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 23 ways as a sum of consecutive naturals, for example, 9112 + ... + 18471.

It is an arithmetic number, because the mean of its divisors is an integer number (4706520).

Almost surely, 2^129088440 is an apocalyptic number.

129088440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129088440 is an abundant number, since it is smaller than the sum of its proper divisors (322737480).

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

129088440 is a wasteful number, since it uses less digits than its factorization.

129088440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27613 (or 27606 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 129088440 is about 11361.7093784342. The cubic root of 129088440 is about 505.3928779459.

The spelling of 129088440 in words is "one hundred twenty-nine million, eighty-eight thousand, four hundred forty".