129783944 has 16 divisors (see below), whose sum is σ = 243536220. Its totient is φ = 64840960.

The previous prime is 129783923. The next prime is 129783959. The reversal of 129783944 is 449387921.

It can be written as a sum of positive squares in 2 ways, for example, as 129095044 + 688900 = 11362^2 + 830^2 .

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, 5804 + ... + 17124.

Almost surely, 2^129783944 is an apocalyptic number.

It is an amenable number.

129783944 is a deficient number, since it is larger than the sum of its proper divisors (113752276).

129783944 is a wasteful number, since it uses less digits than its factorization.

129783944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12760 (or 12756 counting only the distinct ones).

The product of its digits is 435456, while the sum is 47.

The square root of 129783944 is about 11392.2756286881. The cubic root of 129783944 is about 506.2989063356.

The spelling of 129783944 in words is "one hundred twenty-nine million, seven hundred eighty-three thousand, nine hundred forty-four".