40905090 has 24 divisors (see below), whose sum is σ = 106353468. Its totient is φ = 10908000.

The previous prime is 40905071. The next prime is 40905097. The reversal of 40905090 is 9050904.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 37344321 + 3560769 = 6111^2 + 1887^2 .

It is not an unprimeable number, because it can be changed into a prime (40905097) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 227161 + ... + 227340.

Almost surely, 2^40905090 is an apocalyptic number.

40905090 is an abundant number, since it is smaller than the sum of its proper divisors (65448378).

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

40905090 is a wasteful number, since it uses less digits than its factorization.

40905090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454514 (or 454511 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 40905090 is about 6395.7087175699. The cubic root of 40905090 is about 344.5554450514. Note that the first 3 decimals are identical.

Adding to 40905090 its reverse (9050904), we get a palindrome (49955994).

It can be divided in two parts, 4090 and 5090, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 40905090 in words is "forty million, nine hundred five thousand, ninety".