39944161 has 2 divisors, whose sum is σ = 39944162. Its totient is φ = 39944160.

The previous prime is 39944159. The next prime is 39944173. The reversal of 39944161 is 16144993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39929761 + 14400 = 6319^2 + 120^2 .

It is a cyclic number.

It is not a de Polignac number, because 39944161 - 2¹ = 39944159 is a prime.

Together with 39944159, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 39944161.

It is not a weakly prime, because it can be changed into another prime (39944111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19972080 + 19972081.

It is an arithmetic number, because the mean of its divisors is an integer number (19972081).

Almost surely, 2^39944161 is an apocalyptic number.

It is an amenable number.

39944161 is a deficient number, since it is larger than the sum of its proper divisors (1).

39944161 is an equidigital number, since it uses as much as digits as its factorization.

39944161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 37.

The square root of 39944161 is about 6320.1393180847. The cubic root of 39944161 is about 341.8359763151.

The spelling of 39944161 in words is "thirty-nine million, nine hundred forty-four thousand, one hundred sixty-one".