129197026 has 72 divisors (see below), whose sum is σ = 248603904. Its totient is φ = 50062320.

The previous prime is 129197023. The next prime is 129197039. The reversal of 129197026 is 620791921.

It is not an unprimeable number, because it can be changed into a prime (129197021) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3004561 + ... + 3004603.

It is an arithmetic number, because the mean of its divisors is an integer number (3452832).

Almost surely, 2^129197026 is an apocalyptic number.

129197026 is the 6076-th nonagonal number.

129197026 is a deficient number, since it is larger than the sum of its proper divisors (119406878).

129197026 is a wasteful number, since it uses less digits than its factorization.

129197026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 129197026 is about 11366.4869682765. The cubic root of 129197026 is about 505.5345462231.

The spelling of 129197026 in words is "one hundred twenty-nine million, one hundred ninety-seven thousand, twenty-six".