129406025 has 12 divisors (see below), whose sum is σ = 183387072. Its totient is φ = 88735440.

The previous prime is 129406021. The next prime is 129406061. The reversal of 129406025 is 520604921.

It is a happy number.

It is not a de Polignac number, because 129406025 - 2² = 129406021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129406021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 369557 + ... + 369906.

It is an arithmetic number, because the mean of its divisors is an integer number (15282256).

Almost surely, 2^129406025 is an apocalyptic number.

It is an amenable number.

129406025 is a deficient number, since it is larger than the sum of its proper divisors (53981047).

129406025 is an equidigital number, since it uses as much as digits as its factorization.

129406025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739480 (or 739475 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 129406025 is about 11375.6769029364. The cubic root of 129406025 is about 505.8069964916.

The spelling of 129406025 in words is "one hundred twenty-nine million, four hundred six thousand, twenty-five".