129788426 has 16 divisors (see below), whose sum is σ = 198764928. Its totient is φ = 63546000.

The previous prime is 129788423. The next prime is 129788459. The reversal of 129788426 is 624887921.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (129788423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18416 + ... + 24468.

It is an arithmetic number, because the mean of its divisors is an integer number (12422808).

Almost surely, 2^129788426 is an apocalyptic number.

129788426 is a deficient number, since it is larger than the sum of its proper divisors (68976502).

129788426 is a wasteful number, since it uses less digits than its factorization.

129788426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6277.

The product of its digits is 387072, while the sum is 47.

The square root of 129788426 is about 11392.4723392247. The cubic root of 129788426 is about 506.3047344976.

The spelling of 129788426 in words is "one hundred twenty-nine million, seven hundred eighty-eight thousand, four hundred twenty-six".