129785026 has 32 divisors (see below), whose sum is σ = 228182400. Its totient is φ = 55340208.

The previous prime is 129785017. The next prime is 129785027. The reversal of 129785026 is 620587921.

It is a self number, because there is not a number n which added to its sum of digits gives 129785026.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129785027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189681 + ... + 190363.

It is an arithmetic number, because the mean of its divisors is an integer number (7130700).

Almost surely, 2^129785026 is an apocalyptic number.

129785026 is a deficient number, since it is larger than the sum of its proper divisors (98397374).

129785026 is an equidigital number, since it uses as much as digits as its factorization.

129785026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983 (or 969 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 129785026 is about 11392.3231169064. The cubic root of 129785026 is about 506.3003133249.

The spelling of 129785026 in words is "one hundred twenty-nine million, seven hundred eighty-five thousand, twenty-six".