40809990 has 64 divisors (see below), whose sum is σ = 106142400. Its totient is φ = 9982464.

The previous prime is 40809917. The next prime is 40809991. The reversal of 40809990 is 9990804.

40809990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40809991) 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 31 ways as a sum of consecutive naturals, for example, 104716 + ... + 105104.

It is an arithmetic number, because the mean of its divisors is an integer number (1658475).

Almost surely, 2^40809990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40809990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53071200).

40809990 is an abundant number, since it is smaller than the sum of its proper divisors (65332410).

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

40809990 is a wasteful number, since it uses less digits than its factorization.

40809990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 40809990 is about 6388.2697187893. The cubic root of 40809990 is about 344.2882195536.

The spelling of 40809990 in words is "forty million, eight hundred nine thousand, nine hundred ninety".