40569906 has 32 divisors (see below), whose sum is σ = 88216128. Its totient is φ = 12363840.

The previous prime is 40569887. The next prime is 40569911. The reversal of 40569906 is 60996504.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5916 + ... + 10776.

It is an arithmetic number, because the mean of its divisors is an integer number (2756754).

Almost surely, 2^40569906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40569906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44108064).

40569906 is an abundant number, since it is smaller than the sum of its proper divisors (47646222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40569906 is a wasteful number, since it uses less digits than its factorization.

40569906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4986.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 40569906 is about 6369.4509967500. The cubic root of 40569906 is about 343.6117453497.

The spelling of 40569906 in words is "forty million, five hundred sixty-nine thousand, nine hundred six".