39871889 has 2 divisors, whose sum is σ = 39871890. Its totient is φ = 39871888.

The previous prime is 39871883. The next prime is 39871907. The reversal of 39871889 is 98817893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30991489 + 8880400 = 5567^2 + 2980^2 .

It is an emirp because it is prime and its reverse (98817893) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39871889 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39871889.

It is not a weakly prime, because it can be changed into another prime (39871883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19935944 + 19935945.

It is an arithmetic number, because the mean of its divisors is an integer number (19935945).

Almost surely, 2^39871889 is an apocalyptic number.

It is an amenable number.

39871889 is a deficient number, since it is larger than the sum of its proper divisors (1).

39871889 is an equidigital number, since it uses as much as digits as its factorization.

39871889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 53.

The square root of 39871889 is about 6314.4191340138. The cubic root of 39871889 is about 341.6296876364.

The spelling of 39871889 in words is "thirty-nine million, eight hundred seventy-one thousand, eight hundred eighty-nine".