40042313 has 2 divisors, whose sum is σ = 40042314. Its totient is φ = 40042312.

The previous prime is 40042307. The next prime is 40042339. The reversal of 40042313 is 31324004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20043529 + 19998784 = 4477^2 + 4472^2 .

It is a cyclic number.

It is not a de Polignac number, because 40042313 - 2¹² = 40038217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40042291 and 40042300.

It is not a weakly prime, because it can be changed into another prime (40042213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20021156 + 20021157.

It is an arithmetic number, because the mean of its divisors is an integer number (20021157).

Almost surely, 2^40042313 is an apocalyptic number.

It is an amenable number.

40042313 is a deficient number, since it is larger than the sum of its proper divisors (1).

40042313 is an equidigital number, since it uses as much as digits as its factorization.

40042313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 40042313 is about 6327.8995725280. The cubic root of 40042313 is about 342.1157371929.

Adding to 40042313 its reverse (31324004), we get a palindrome (71366317).

The spelling of 40042313 in words is "forty million, forty-two thousand, three hundred thirteen".