40315997 has 4 divisors (see below), whose sum is σ = 41299356. Its totient is φ = 39332640.

The previous prime is 40315969. The next prime is 40315999. The reversal of 40315997 is 79951304.

It is a happy number.

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 6046681 + 34269316 = 2459^2 + 5854^2 .

It is a cyclic number.

It is not a de Polignac number, because 40315997 - 2⁸ = 40315741 is a prime.

It is a super-2 number, since 2×40315997² = 3250759228208018, which contains 22 as substring.

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 40315997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40315999) 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, 491618 + ... + 491699.

It is an arithmetic number, because the mean of its divisors is an integer number (10324839).

Almost surely, 2^40315997 is an apocalyptic number.

It is an amenable number.

40315997 is a deficient number, since it is larger than the sum of its proper divisors (983359).

40315997 is an equidigital number, since it uses as much as digits as its factorization.

40315997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983358.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 40315997 is about 6349.4879321092. The cubic root of 40315997 is about 342.8934069694.

The spelling of 40315997 in words is "forty million, three hundred fifteen thousand, nine hundred ninety-seven".