40205090 has 16 divisors (see below), whose sum is σ = 72456120. Its totient is φ = 16062720.

The previous prime is 40205089. The next prime is 40205093. The reversal of 40205090 is 9050204.

40205090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 30724849 + 9480241 = 5543^2 + 3079^2 .

It is not an unprimeable number, because it can be changed into a prime (40205093) 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 7 ways as a sum of consecutive naturals, for example, 8810 + ... + 12570.

Almost surely, 2^40205090 is an apocalyptic number.

40205090 is a deficient number, since it is larger than the sum of its proper divisors (32251030).

40205090 is a wasteful number, since it uses less digits than its factorization.

40205090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4837.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 40205090 is about 6340.7483785433. The cubic root of 40205090 is about 342.5786914931.

Adding to 40205090 its reverse (9050204), we get a palindrome (49255294).

The spelling of 40205090 in words is "forty million, two hundred five thousand, ninety".