39999901 has 2 divisors, whose sum is σ = 39999902. Its totient is φ = 39999900.

The previous prime is 39999899. The next prime is 39999907. The reversal of 39999901 is 10999993.

39999901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27931225 + 12068676 = 5285^2 + 3474^2 .

It is a cyclic number.

It is not a de Polignac number, because 39999901 - 2¹ = 39999899 is a prime.

Together with 39999899, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39999907) 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, 19999950 + 19999951.

It is an arithmetic number, because the mean of its divisors is an integer number (19999951).

Almost surely, 2^39999901 is an apocalyptic number.

It is an amenable number.

39999901 is a deficient number, since it is larger than the sum of its proper divisors (1).

39999901 is an equidigital number, since it uses as much as digits as its factorization.

39999901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 177147, while the sum is 49.

The square root of 39999901 is about 6324.5474936947. The cubic root of 39999901 is about 341.9949071891.

The spelling of 39999901 in words is "thirty-nine million, nine hundred ninety-nine thousand, nine hundred one".