129161040 has 80 divisors (see below), whose sum is σ = 401932608. Its totient is φ = 34311168.

The previous prime is 129161033. The next prime is 129161051. The reversal of 129161040 is 40161921.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 129161040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72804 + ... + 74556.

Almost surely, 2^129161040 is an apocalyptic number.

129161040 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 129161040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200966304).

129161040 is an abundant number, since it is smaller than the sum of its proper divisors (272771568).

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

129161040 is a wasteful number, since it uses less digits than its factorization.

129161040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076 (or 2070 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 129161040 is about 11364.9038711289. The cubic root of 129161040 is about 505.4876053710.

The spelling of 129161040 in words is "one hundred twenty-nine million, one hundred sixty-one thousand, forty".