40890505 has 4 divisors (see below), whose sum is σ = 49068612. Its totient is φ = 32712400.

The previous prime is 40890449. The next prime is 40890511. The reversal of 40890505 is 50509804.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23551609 + 17338896 = 4853^2 + 4164^2 .

It is not a de Polignac number, because 40890505 - 2⁹ = 40889993 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4089046 + ... + 4089055.

It is an arithmetic number, because the mean of its divisors is an integer number (12267153).

Almost surely, 2^40890505 is an apocalyptic number.

It is an amenable number.

40890505 is a deficient number, since it is larger than the sum of its proper divisors (8178107).

40890505 is an equidigital number, since it uses as much as digits as its factorization.

40890505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8178106.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 40890505 is about 6394.5683982580. The cubic root of 40890505 is about 344.5144889540.

The spelling of 40890505 in words is "forty million, eight hundred ninety thousand, five hundred five".