129441940 has 12 divisors (see below), whose sum is σ = 271828116. Its totient is φ = 51776768.

The previous prime is 129441931. The next prime is 129441971. The reversal of 129441940 is 49144921.

It can be written as a sum of positive squares in 2 ways, for example, as 87684496 + 41757444 = 9364^2 + 6462^2 .

It is a junction number, because it is equal to n+sod(n) for n = 129441896 and 129441905.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3236029 + ... + 3236068.

It is an arithmetic number, because the mean of its divisors is an integer number (22652343).

Almost surely, 2^129441940 is an apocalyptic number.

129441940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129441940 is an abundant number, since it is smaller than the sum of its proper divisors (142386176).

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

129441940 is a wasteful number, since it uses less digits than its factorization.

129441940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6472106 (or 6472104 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 129441940 is about 11377.2553808025. The cubic root of 129441940 is about 505.8537856009.

It can be divided in two parts, 12944 and 1940, that added together give a square (14884 = 122²).

The spelling of 129441940 in words is "one hundred twenty-nine million, four hundred forty-one thousand, nine hundred forty".