40290505 has 4 divisors (see below), whose sum is σ = 48348612. Its totient is φ = 32232400.

The previous prime is 40290479. The next prime is 40290511. The reversal of 40290505 is 50509204.

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 12538681 + 27751824 = 3541^2 + 5268^2 .

It is not a de Polignac number, because 40290505 - 2⁵ = 40290473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40290505.

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, 4029046 + ... + 4029055.

It is an arithmetic number, because the mean of its divisors is an integer number (12087153).

Almost surely, 2^40290505 is an apocalyptic number.

It is an amenable number.

40290505 is a deficient number, since it is larger than the sum of its proper divisors (8058107).

40290505 is an equidigital number, since it uses as much as digits as its factorization.

40290505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8058106.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 40290505 is about 6347.4802087127. The cubic root of 40290505 is about 342.8211206781.

Adding to 40290505 its reverse (50509204), we get a palindrome (90799709).

The spelling of 40290505 in words is "forty million, two hundred ninety thousand, five hundred five".