39994813 has 2 divisors, whose sum is σ = 39994814. Its totient is φ = 39994812.

The previous prime is 39994789. The next prime is 39994831. The reversal of 39994813 is 31849993.

39994813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (39994831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35676729 + 4318084 = 5973^2 + 2078^2 .

It is a cyclic number.

It is not a de Polignac number, because 39994813 - 2⁹ = 39994301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39994853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19997406 + 19997407.

It is an arithmetic number, because the mean of its divisors is an integer number (19997407).

Almost surely, 2^39994813 is an apocalyptic number.

It is an amenable number.

39994813 is a deficient number, since it is larger than the sum of its proper divisors (1).

39994813 is an equidigital number, since it uses as much as digits as its factorization.

39994813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 46.

The square root of 39994813 is about 6324.1452386864. The cubic root of 39994813 is about 341.9804059543.

The spelling of 39994813 in words is "thirty-nine million, nine hundred ninety-four thousand, eight hundred thirteen".