40040646 has 32 divisors (see below), whose sum is σ = 81997920. Its totient is φ = 13031424.

The previous prime is 40040633. The next prime is 40040647. The reversal of 40040646 is 64604004.

40040646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40040647) 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 15 ways as a sum of consecutive naturals, for example, 49090 + ... + 49898.

It is an arithmetic number, because the mean of its divisors is an integer number (2562435).

Almost surely, 2^40040646 is an apocalyptic number.

40040646 is an abundant number, since it is smaller than the sum of its proper divisors (41957274).

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

40040646 is a wasteful number, since it uses less digits than its factorization.

40040646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 40040646 is about 6327.7678528846. The cubic root of 40040646 is about 342.1109895913.

The spelling of 40040646 in words is "forty million, forty thousand, six hundred forty-six".