40640315 has 4 divisors (see below), whose sum is σ = 48768384. Its totient is φ = 32512248.

The previous prime is 40640311. The next prime is 40640317. The reversal of 40640315 is 51304604.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 40640315 - 2² = 40640311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40640311) 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, 4064027 + ... + 4064036.

It is an arithmetic number, because the mean of its divisors is an integer number (12192096).

Almost surely, 2^40640315 is an apocalyptic number.

40640315 is a deficient number, since it is larger than the sum of its proper divisors (8128069).

40640315 is an equidigital number, since it uses as much as digits as its factorization.

40640315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8128068.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 40640315 is about 6374.9756862281. The cubic root of 40640315 is about 343.8104096586.

Adding to 40640315 its reverse (51304604), we get a palindrome (91944919).

The spelling of 40640315 in words is "forty million, six hundred forty thousand, three hundred fifteen".