129781424 has 10 divisors (see below), whose sum is σ = 251451540. Its totient is φ = 64890704.

The previous prime is 129781403. The next prime is 129781447. The reversal of 129781424 is 424187921.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4055654 + ... + 4055685.

It is an arithmetic number, because the mean of its divisors is an integer number (25145154).

Almost surely, 2^129781424 is an apocalyptic number.

It is an amenable number.

129781424 is a deficient number, since it is larger than the sum of its proper divisors (121670116).

129781424 is an equidigital number, since it uses as much as digits as its factorization.

129781424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8111347 (or 8111341 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 129781424 is about 11392.1650268946. The cubic root of 129781424 is about 506.2956293984.

The spelling of 129781424 in words is "one hundred twenty-nine million, seven hundred eighty-one thousand, four hundred twenty-four".