129505026 has 32 divisors (see below), whose sum is σ = 311592960. Its totient is φ = 35053776.

The previous prime is 129505009. The next prime is 129505043. The reversal of 129505026 is 620505921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (129505009) and next prime (129505043).

It is a junction number, because it is equal to n+sod(n) for n = 129504984 and 129505002.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80346 + ... + 81941.

It is an arithmetic number, because the mean of its divisors is an integer number (9737280).

Almost surely, 2^129505026 is an apocalyptic number.

129505026 is an abundant number, since it is smaller than the sum of its proper divisors (182087934).

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

129505026 is a wasteful number, since it uses less digits than its factorization.

129505026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162318.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 129505026 is about 11380.0275043604. The cubic root of 129505026 is about 505.9359514197.

The spelling of 129505026 in words is "one hundred twenty-nine million, five hundred five thousand, twenty-six".