40520129 has 8 divisors (see below), whose sum is σ = 46204200. Its totient is φ = 35202816.

The previous prime is 40520111. The next prime is 40520149. The reversal of 40520129 is 92102504.

It can be written as a sum of positive squares in 4 ways, for example, as 4243600 + 36276529 = 2060^2 + 6023^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40520129 - 2¹² = 40516033 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 (40520149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91454 + ... + 91895.

It is an arithmetic number, because the mean of its divisors is an integer number (5775525).

Almost surely, 2^40520129 is an apocalyptic number.

It is an amenable number.

40520129 is a deficient number, since it is larger than the sum of its proper divisors (5684071).

40520129 is a wasteful number, since it uses less digits than its factorization.

40520129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183379.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 40520129 is about 6365.5423178234. The cubic root of 40520129 is about 343.4711570541.

The spelling of 40520129 in words is "forty million, five hundred twenty thousand, one hundred twenty-nine".