123078689 has 4 divisors (see below), whose sum is σ = 123431700. Its totient is φ = 122725680.

The previous prime is 123078677. The next prime is 123078731. The reversal of 123078689 is 986870321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 986870321 = 137 ⋅7203433.

It can be written as a sum of positive squares in 2 ways, for example, as 88209664 + 34869025 = 9392^2 + 5905^2 .

It is a cyclic number.

It is not a de Polignac number, because 123078689 - 2⁴ = 123078673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123078089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175982 + ... + 176679.

It is an arithmetic number, because the mean of its divisors is an integer number (30857925).

Almost surely, 2^123078689 is an apocalyptic number.

It is an amenable number.

123078689 is a deficient number, since it is larger than the sum of its proper divisors (353011).

123078689 is an equidigital number, since it uses as much as digits as its factorization.

123078689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353010.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 123078689 is about 11094.0835132966. The cubic root of 123078689 is about 497.4250136554.

The spelling of 123078689 in words is "one hundred twenty-three million, seventy-eight thousand, six hundred eighty-nine".