129240144 has 80 divisors (see below), whose sum is σ = 404706240. Its totient is φ = 39162240.

The previous prime is 129240143. The next prime is 129240161. The reversal of 129240144 is 441042921.

It is a happy number.

It is a super-2 number, since 2×129240144² = 33406029642281472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129240143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8847 + ... + 18350.

It is an arithmetic number, because the mean of its divisors is an integer number (5058828).

Almost surely, 2^129240144 is an apocalyptic number.

It is an amenable number.

129240144 is an abundant number, since it is smaller than the sum of its proper divisors (275466096).

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

129240144 is a wasteful number, since it uses less digits than its factorization.

129240144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27225 (or 27213 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 129240144 is about 11368.3835262539. The cubic root of 129240144 is about 505.5907787201.

The spelling of 129240144 in words is "one hundred twenty-nine million, two hundred forty thousand, one hundred forty-four".