129678726 has 16 divisors (see below), whose sum is σ = 260436528. Its totient is φ = 43046400.

The previous prime is 129678707. The next prime is 129678727. The reversal of 129678726 is 627876921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129678727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43395 + ... + 46286.

It is an arithmetic number, because the mean of its divisors is an integer number (16277283).

Almost surely, 2^129678726 is an apocalyptic number.

129678726 is an abundant number, since it is smaller than the sum of its proper divisors (130757802).

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

129678726 is a wasteful number, since it uses less digits than its factorization.

129678726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89927.

The product of its digits is 508032, while the sum is 48.

The square root of 129678726 is about 11387.6567387676. The cubic root of 129678726 is about 506.1620476989.

The spelling of 129678726 in words is "one hundred twenty-nine million, six hundred seventy-eight thousand, seven hundred twenty-six".