129025040 has 40 divisors (see below), whose sum is σ = 300837888. Its totient is φ = 51463040.

The previous prime is 129025003. The next prime is 129025063. The reversal of 129025040 is 40520921.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 129024997 and 129025015.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28535 + ... + 32745.

Almost surely, 2^129025040 is an apocalyptic number.

129025040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129025040 is an abundant number, since it is smaller than the sum of its proper divisors (171812848).

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

129025040 is a wasteful number, since it uses less digits than its factorization.

129025040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4607 (or 4601 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 129025040 is about 11358.9189626478. The cubic root of 129025040 is about 505.3101254920.

Adding to 129025040 its reverse (40520921), we get a palindrome (169545961).

The spelling of 129025040 in words is "one hundred twenty-nine million, twenty-five thousand, forty".