40209129 has 40 divisors (see below), whose sum is σ = 63562752. Its totient is φ = 25280640.

The previous prime is 40209107. The next prime is 40209137. The reversal of 40209129 is 92190204.

40209129 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40209129 - 2⁸ = 40208873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40209229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 210424 + ... + 210614.

Almost surely, 2^40209129 is an apocalyptic number.

It is an amenable number.

40209129 is a deficient number, since it is larger than the sum of its proper divisors (23353623).

40209129 is a wasteful number, since it uses less digits than its factorization.

40209129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 40209129 is about 6341.0668660723. The cubic root of 40209129 is about 342.5901629179.

The spelling of 40209129 in words is "forty million, two hundred nine thousand, one hundred twenty-nine".