39944393 has 2 divisors, whose sum is σ = 39944394. Its totient is φ = 39944392.

The previous prime is 39944371. The next prime is 39944413. The reversal of 39944393 is 39344993.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21557449 + 18386944 = 4643^2 + 4288^2 .

It is an emirp because it is prime and its reverse (39344993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39944393 - 2⁶ = 39944329 is a prime.

It is not a weakly prime, because it can be changed into another prime (39944363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19972196 + 19972197.

It is an arithmetic number, because the mean of its divisors is an integer number (19972197).

Almost surely, 2^39944393 is an apocalyptic number.

It is an amenable number.

39944393 is a deficient number, since it is larger than the sum of its proper divisors (1).

39944393 is an equidigital number, since it uses as much as digits as its factorization.

39944393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 44.

The square root of 39944393 is about 6320.1576720838. The cubic root of 39944393 is about 341.8366381205.

The spelling of 39944393 in words is "thirty-nine million, nine hundred forty-four thousand, three hundred ninety-three".