39889439 has 2 divisors, whose sum is σ = 39889440. Its totient is φ = 39889438.

The previous prime is 39889427. The next prime is 39889457. The reversal of 39889439 is 93498893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39889439 - 2⁸ = 39889183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39889459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19944719 + 19944720.

It is an arithmetic number, because the mean of its divisors is an integer number (19944720).

Almost surely, 2^39889439 is an apocalyptic number.

39889439 is a deficient number, since it is larger than the sum of its proper divisors (1).

39889439 is an equidigital number, since it uses as much as digits as its factorization.

39889439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 53.

The square root of 39889439 is about 6315.8086576463. The cubic root of 39889439 is about 341.6798041614.

The spelling of 39889439 in words is "thirty-nine million, eight hundred eighty-nine thousand, four hundred thirty-nine".