40106409 has 32 divisors (see below), whose sum is σ = 63737856. Its totient is φ = 21954240.

The previous prime is 40106399. The next prime is 40106447. The reversal of 40106409 is 90460104.

It is not a de Polignac number, because 40106409 - 2⁵ = 40106377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40106309) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54804 + ... + 55530.

It is an arithmetic number, because the mean of its divisors is an integer number (1991808).

Almost surely, 2^40106409 is an apocalyptic number.

It is an amenable number.

40106409 is a deficient number, since it is larger than the sum of its proper divisors (23631447).

40106409 is a wasteful number, since it uses less digits than its factorization.

40106409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 40106409 is about 6332.9621031552. The cubic root of 40106409 is about 342.2981822017.

The spelling of 40106409 in words is "forty million, one hundred six thousand, four hundred nine".