289978123 has 4 divisors (see below), whose sum is σ = 299332288. Its totient is φ = 280623960.

The previous prime is 289978121. The next prime is 289978127. The reversal of 289978123 is 321879982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321879982 = 2 ⋅160939991.

It is a cyclic number.

It is not a de Polignac number, because 289978123 - 2¹ = 289978121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (289978121) 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 in 3 ways as a sum of consecutive naturals, for example, 4677036 + ... + 4677097.

It is an arithmetic number, because the mean of its divisors is an integer number (74833072).

Almost surely, 2^289978123 is an apocalyptic number.

289978123 is a deficient number, since it is larger than the sum of its proper divisors (9354165).

289978123 is an equidigital number, since it uses as much as digits as its factorization.

289978123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9354164.

The product of its digits is 435456, while the sum is 49.

The square root of 289978123 is about 17028.7440229748. The cubic root of 289978123 is about 661.8939499955.

The spelling of 289978123 in words is "two hundred eighty-nine million, nine hundred seventy-eight thousand, one hundred twenty-three".