40312313 has 2 divisors, whose sum is σ = 40312314. Its totient is φ = 40312312.

The previous prime is 40312301. The next prime is 40312343. The reversal of 40312313 is 31321304.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40094224 + 218089 = 6332^2 + 467^2 .

It is a cyclic number.

It is not a de Polignac number, because 40312313 - 2¹⁶ = 40246777 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40312291 and 40312300.

It is not a weakly prime, because it can be changed into another prime (40312343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20156156 + 20156157.

It is an arithmetic number, because the mean of its divisors is an integer number (20156157).

Almost surely, 2^40312313 is an apocalyptic number.

It is an amenable number.

40312313 is a deficient number, since it is larger than the sum of its proper divisors (1).

40312313 is an equidigital number, since it uses as much as digits as its factorization.

40312313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 40312313 is about 6349.1978233475. The cubic root of 40312313 is about 342.8829623330.

Adding to 40312313 its reverse (31321304), we get a palindrome (71633617).

The spelling of 40312313 in words is "forty million, three hundred twelve thousand, three hundred thirteen".