1939944439 has 2 divisors, whose sum is σ = 1939944440. Its totient is φ = 1939944438.

The previous prime is 1939944427. The next prime is 1939944449. The reversal of 1939944439 is 9344499391.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1939944439 - 2¹³ = 1939936247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1939944439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1939944449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969972219 + 969972220.

It is an arithmetic number, because the mean of its divisors is an integer number (969972220).

Almost surely, 2^1939944439 is an apocalyptic number.

1939944439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1939944439 is an equidigital number, since it uses as much as digits as its factorization.

1939944439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3779136, while the sum is 55.

The square root of 1939944439 is about 44044.8003628124. The cubic root of 1939944439 is about 1247.1817979515.

The spelling of 1939944439 in words is "one billion, nine hundred thirty-nine million, nine hundred forty-four thousand, four hundred thirty-nine".