389989 has 2 divisors, whose sum is σ = 389990. Its totient is φ = 389988.

The previous prime is 389981. The next prime is 389999. The reversal of 389989 is 989983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202500 + 187489 = 450^2 + 433^2 .

It is a cyclic number.

It is not a de Polignac number, because 389989 - 2³ = 389981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194994 + 194995.

It is an arithmetic number, because the mean of its divisors is an integer number (194995).

2³⁸⁹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

389989 is a deficient number, since it is larger than the sum of its proper divisors (1).

389989 is an equidigital number, since it uses as much as digits as its factorization.

389989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 46.

The square root of 389989 is about 624.4909927293. The cubic root of 389989 is about 73.0607488318.

It can be divided in two parts, 389 and 989, that added together give a triangular number (1378 = T₅₂).

The spelling of 389989 in words is "three hundred eighty-nine thousand, nine hundred eighty-nine".