39661841 has 2 divisors, whose sum is σ = 39661842. Its totient is φ = 39661840.

The previous prime is 39661837. The next prime is 39661859. The reversal of 39661841 is 14816693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39325441 + 336400 = 6271^2 + 580^2 .

It is an emirp because it is prime and its reverse (14816693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39661841 - 2² = 39661837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39661795 and 39661804.

It is not a weakly prime, because it can be changed into another prime (39661441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19830920 + 19830921.

It is an arithmetic number, because the mean of its divisors is an integer number (19830921).

Almost surely, 2^39661841 is an apocalyptic number.

It is an amenable number.

39661841 is a deficient number, since it is larger than the sum of its proper divisors (1).

39661841 is an equidigital number, since it uses as much as digits as its factorization.

39661841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 39661841 is about 6297.7647621994. The cubic root of 39661841 is about 341.0287211041.

The spelling of 39661841 in words is "thirty-nine million, six hundred sixty-one thousand, eight hundred forty-one".