40312505 has 4 divisors (see below), whose sum is σ = 48375012. Its totient is φ = 32250000.

The previous prime is 40312487. The next prime is 40312507. The reversal of 40312505 is 50521304.

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 14830201 + 25482304 = 3851^2 + 5048^2 .

It is a de Polignac number, because none of the positive numbers 2^k-40312505 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40312507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4031246 + ... + 4031255.

It is an arithmetic number, because the mean of its divisors is an integer number (12093753).

Almost surely, 2^40312505 is an apocalyptic number.

It is an amenable number.

40312505 is a deficient number, since it is larger than the sum of its proper divisors (8062507).

40312505 is an equidigital number, since it uses as much as digits as its factorization.

40312505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8062506.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 40312505 is about 6349.2129433498. The cubic root of 40312505 is about 342.8835066946.

Adding to 40312505 its reverse (50521304), we get a palindrome (90833809).

The spelling of 40312505 in words is "forty million, three hundred twelve thousand, five hundred five".