39889709 has 2 divisors, whose sum is σ = 39889710. Its totient is φ = 39889708.

The previous prime is 39889697. The next prime is 39889727. The reversal of 39889709 is 90798893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38502025 + 1387684 = 6205^2 + 1178^2 .

It is an emirp because it is prime and its reverse (90798893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39889709 - 2⁴ = 39889693 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39889789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19944854 + 19944855.

It is an arithmetic number, because the mean of its divisors is an integer number (19944855).

Almost surely, 2^39889709 is an apocalyptic number.

It is an amenable number.

39889709 is a deficient number, since it is larger than the sum of its proper divisors (1).

39889709 is an equidigital number, since it uses as much as digits as its factorization.

39889709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 39889709 is about 6315.8300325452. The cubic root of 39889709 is about 341.6805750700.

The spelling of 39889709 in words is "thirty-nine million, eight hundred eighty-nine thousand, seven hundred nine".