39944039 has 2 divisors, whose sum is σ = 39944040. Its totient is φ = 39944038.

The previous prime is 39944017. The next prime is 39944041. The reversal of 39944039 is 93044993.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (93044993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39944039 - 2¹² = 39939943 is a prime.

It is a Sophie Germain prime.

Together with 39944041, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 39943987 and 39944005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39944539) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19972019 + 19972020.

It is an arithmetic number, because the mean of its divisors is an integer number (19972020).

Almost surely, 2^39944039 is an apocalyptic number.

39944039 is a deficient number, since it is larger than the sum of its proper divisors (1).

39944039 is an equidigital number, since it uses as much as digits as its factorization.

39944039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 39944039 is about 6320.1296663913. The cubic root of 39944039 is about 341.8356282956.

The spelling of 39944039 in words is "thirty-nine million, nine hundred forty-four thousand, thirty-nine".