40090820 has 72 divisors (see below), whose sum is σ = 106868160. Its totient is φ = 12492480.

The previous prime is 40090819. The next prime is 40090837. The reversal of 40090820 is 2809004.

40090820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 8921 + ... + 12639.

It is an arithmetic number, because the mean of its divisors is an integer number (1484280).

Almost surely, 2^40090820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40090820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53434080).

40090820 is an abundant number, since it is smaller than the sum of its proper divisors (66777340).

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

40090820 is a wasteful number, since it uses less digits than its factorization.

40090820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3753 (or 3744 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 40090820 is about 6331.7312008644. The cubic root of 40090820 is about 342.2538270475.

Adding to 40090820 its reverse (2809004), we get a palindrome (42899824).

The spelling of 40090820 in words is "forty million, ninety thousand, eight hundred twenty".