40126813 has 2 divisors, whose sum is σ = 40126814. Its totient is φ = 40126812.

The previous prime is 40126787. The next prime is 40126829. The reversal of 40126813 is 31862104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21696964 + 18429849 = 4658^2 + 4293^2 .

It is a cyclic number.

It is not a de Polignac number, because 40126813 - 2⁵ = 40126781 is a prime.

It is a super-2 number, since 2×40126813² = 3220322243073938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40126873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20063406 + 20063407.

It is an arithmetic number, because the mean of its divisors is an integer number (20063407).

Almost surely, 2^40126813 is an apocalyptic number.

It is an amenable number.

40126813 is a deficient number, since it is larger than the sum of its proper divisors (1).

40126813 is an equidigital number, since it uses as much as digits as its factorization.

40126813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 40126813 is about 6334.5728348485. The cubic root of 40126813 is about 342.3562200417.

Adding to 40126813 its reverse (31862104), we get a palindrome (71988917).

The spelling of 40126813 in words is "forty million, one hundred twenty-six thousand, eight hundred thirteen".