129056405 has 16 divisors (see below), whose sum is σ = 157896000. Its totient is φ = 101240832.

The previous prime is 129056371. The next prime is 129056429. The reversal of 129056405 is 504650921.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 129056405 - 2⁸ = 129056149 is a prime.

It is a congruent number.

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, 85346 + ... + 86844.

It is an arithmetic number, because the mean of its divisors is an integer number (9868500).

Almost surely, 2^129056405 is an apocalyptic number.

It is an amenable number.

129056405 is a deficient number, since it is larger than the sum of its proper divisors (28839595).

129056405 is a wasteful number, since it uses less digits than its factorization.

129056405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 129056405 is about 11360.2995118967. The cubic root of 129056405 is about 505.3510678496.

The spelling of 129056405 in words is "one hundred twenty-nine million, fifty-six thousand, four hundred five".