129143040 has 216 divisors, whose sum is σ = 448862400. Its totient is φ = 31629312.

The previous prime is 129143029. The next prime is 129143099. The reversal of 129143040 is 40341921.

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 129143040.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 648861 + ... + 649059.

Almost surely, 2^129143040 is an apocalyptic number.

129143040 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 129143040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224431200).

129143040 is an abundant number, since it is smaller than the sum of its proper divisors (319719360).

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

129143040 is a wasteful number, since it uses less digits than its factorization.

129143040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 129143040 is about 11364.1119318669. Note that the first 3 decimals coincide. The cubic root of 129143040 is about 505.4641225426.

Adding to 129143040 its reverse (40341921), we get a palindrome (169484961).

The spelling of 129143040 in words is "one hundred twenty-nine million, one hundred forty-three thousand, forty".