389999 has 2 divisors, whose sum is σ = 390000. Its totient is φ = 389998.

The previous prime is 389989. The next prime is 390001. The reversal of 389999 is 999983.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (999983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 389999 - 2⁸ = 389743 is a prime.

Together with 390001, it forms a pair of twin primes.

It is a Chen prime.

389999 is a modest number, since divided by 999 gives 389 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194999 + 195000.

It is an arithmetic number, because the mean of its divisors is an integer number (195000).

2³⁸⁹⁹⁹⁹ is an apocalyptic number.

389999 is a deficient number, since it is larger than the sum of its proper divisors (1).

389999 is an equidigital number, since it uses as much as digits as its factorization.

389999 is an evil number, because the sum of its binary digits is even.

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

The square root of 389999 is about 624.4989991986. The cubic root of 389999 is about 73.0613732949.

The spelling of 389999 in words is "three hundred eighty-nine thousand, nine hundred ninety-nine".