38780813 has 2 divisors, whose sum is σ = 38780814. Its totient is φ = 38780812.

The previous prime is 38780761. The next prime is 38780827. The reversal of 38780813 is 31808783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22676644 + 16104169 = 4762^2 + 4013^2 .

It is a cyclic number.

It is not a de Polignac number, because 38780813 - 2⁸ = 38780557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38780513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19390406 + 19390407.

It is an arithmetic number, because the mean of its divisors is an integer number (19390407).

Almost surely, 2^38780813 is an apocalyptic number.

It is an amenable number.

38780813 is a deficient number, since it is larger than the sum of its proper divisors (1).

38780813 is an equidigital number, since it uses as much as digits as its factorization.

38780813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 38780813 is about 6227.4242669020. The cubic root of 38780813 is about 338.4846431581.

It can be divided in two parts, 38780 and 813, that added together give a palindrome (39593).

The spelling of 38780813 in words is "thirty-eight million, seven hundred eighty thousand, eight hundred thirteen".