40315393 has 2 divisors, whose sum is σ = 40315394. Its totient is φ = 40315392.

The previous prime is 40315391. The next prime is 40315403. The reversal of 40315393 is 39351304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29246464 + 11068929 = 5408^2 + 3327^2 .

It is a cyclic number.

It is not a de Polignac number, because 40315393 - 2¹ = 40315391 is a prime.

Together with 40315391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40315391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20157696 + 20157697.

It is an arithmetic number, because the mean of its divisors is an integer number (20157697).

Almost surely, 2^40315393 is an apocalyptic number.

It is an amenable number.

40315393 is a deficient number, since it is larger than the sum of its proper divisors (1).

40315393 is an equidigital number, since it uses as much as digits as its factorization.

40315393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 40315393 is about 6349.4403690404. The cubic root of 40315393 is about 342.8916945916.

Adding to 40315393 its reverse (39351304), we get a palindrome (79666697).

The spelling of 40315393 in words is "forty million, three hundred fifteen thousand, three hundred ninety-three".