129632440 has 144 divisors (see below), whose sum is σ = 363306600. Its totient is φ = 41392512.

The previous prime is 129632431. The next prime is 129632441. The reversal of 129632440 is 44236921.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129632441) 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 35 ways as a sum of consecutive naturals, for example, 2197131 + ... + 2197189.

Almost surely, 2^129632440 is an apocalyptic number.

129632440 is a gapful number since it is divisible by the number (10) 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 129632440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181653300).

129632440 is an abundant number, since it is smaller than the sum of its proper divisors (233674160).

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

129632440 is a wasteful number, since it uses less digits than its factorization.

129632440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 92 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 129632440 is about 11385.6242692265. The cubic root of 129632440 is about 506.1018193556.

The spelling of 129632440 in words is "one hundred twenty-nine million, six hundred thirty-two thousand, four hundred forty".