939989 has 2 divisors, whose sum is σ = 939990. Its totient is φ = 939988.

The previous prime is 939973. The next prime is 939997. The reversal of 939989 is 989939.

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., 935089 + 4900 = 967^2 + 70^2 .

It is an emirp because it is prime and its reverse (989939) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 939989 - 2⁴ = 939973 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (939089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 469994 + 469995.

It is an arithmetic number, because the mean of its divisors is an integer number (469995).

2⁹³⁹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

939989 is a deficient number, since it is larger than the sum of its proper divisors (1).

939989 is an equidigital number, since it uses as much as digits as its factorization.

939989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 47.

The square root of 939989 is about 969.5302986498. The cubic root of 939989 is about 97.9582287620.

The spelling of 939989 in words is "nine hundred thirty-nine thousand, nine hundred eighty-nine".