129440024 has 32 divisors (see below), whose sum is σ = 277737120. Its totient is φ = 55401216.

The previous prime is 129439969. The next prime is 129440039. The reversal of 129440024 is 420044921.

It is a junction number, because it is equal to n+sod(n) for n = 129439975 and 129440002.

It is a congruent number.

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, 79442 + ... + 81054.

It is an arithmetic number, because the mean of its divisors is an integer number (8679285).

Almost surely, 2^129440024 is an apocalyptic number.

129440024 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

129440024 is an abundant number, since it is smaller than the sum of its proper divisors (148297096).

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

129440024 is a wasteful number, since it uses less digits than its factorization.

129440024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3059 (or 3055 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 129440024 is about 11377.1711774061. The cubic root of 129440024 is about 505.8512897055.

Adding to 129440024 its reverse (420044921), we get a palindrome (549484945).

The spelling of 129440024 in words is "one hundred twenty-nine million, four hundred forty thousand, twenty-four".