129529905 has 16 divisors (see below), whose sum is σ = 216259200. Its totient is φ = 66078848.

The previous prime is 129529879. The next prime is 129529913. The reversal of 129529905 is 509925921.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 129529905 - 2¹¹ = 129527857 is a prime.

It is a super-3 number, since 3×129529905³ (a number of 25 digits) contains 333 as substring.

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, 187380 + ... + 188069.

It is an arithmetic number, because the mean of its divisors is an integer number (13516200).

Almost surely, 2^129529905 is an apocalyptic number.

129529905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129529905 is a deficient number, since it is larger than the sum of its proper divisors (86729295).

129529905 is a wasteful number, since it uses less digits than its factorization.

129529905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375480.

The product of its (nonzero) digits is 72900, while the sum is 42.

The square root of 129529905 is about 11381.1205511584. The cubic root of 129529905 is about 505.9683475230.

The spelling of 129529905 in words is "one hundred twenty-nine million, five hundred twenty-nine thousand, nine hundred five".