389999999 has 2 divisors, whose sum is σ = 390000000. Its totient is φ = 389999998.

The previous prime is 389999989. The next prime is 390000041. The reversal of 389999999 is 999999983.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 389999999 - 2²⁸ = 121564543 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

389999999 is a modest number, since divided by 99999 gives 3899 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 (389999989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194999999 + 195000000.

It is an arithmetic number, because the mean of its divisors is an integer number (195000000).

Almost surely, 2^389999999 is an apocalyptic number.

389999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

389999999 is an equidigital number, since it uses as much as digits as its factorization.

389999999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 114791256, while the sum is 74.

The square root of 389999999 is about 19748.4176328130. The cubic root of 389999999 is about 730.6143567818.

The spelling of 389999999 in words is "three hundred eighty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".