389999123 has 4 divisors (see below), whose sum is σ = 390101880. Its totient is φ = 389896368.

The previous prime is 389999101. The next prime is 389999173. The reversal of 389999123 is 321999983.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 389999123 - 2⁸ = 389998867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389999173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45458 + ... + 53351.

It is an arithmetic number, because the mean of its divisors is an integer number (97525470).

Almost surely, 2^389999123 is an apocalyptic number.

389999123 is a deficient number, since it is larger than the sum of its proper divisors (102757).

389999123 is an equidigital number, since it uses as much as digits as its factorization.

389999123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102756.

The product of its digits is 944784, while the sum is 53.

The square root of 389999123 is about 19748.3954538084. The cubic root of 389999123 is about 730.6138097573.

The spelling of 389999123 in words is "three hundred eighty-nine million, nine hundred ninety-nine thousand, one hundred twenty-three".