123742789 has 2 divisors, whose sum is σ = 123742790. Its totient is φ = 123742788.

The previous prime is 123742753. The next prime is 123742807. The reversal of 123742789 is 987247321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111197025 + 12545764 = 10545^2 + 3542^2 .

It is an emirp because it is prime and its reverse (987247321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123742789 - 2¹⁵ = 123710021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123742589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61871394 + 61871395.

It is an arithmetic number, because the mean of its divisors is an integer number (61871395).

Almost surely, 2^123742789 is an apocalyptic number.

It is an amenable number.

123742789 is a deficient number, since it is larger than the sum of its proper divisors (1).

123742789 is an equidigital number, since it uses as much as digits as its factorization.

123742789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 43.

The square root of 123742789 is about 11123.9736155746. The cubic root of 123742789 is about 498.3180672149.

The spelling of 123742789 in words is "one hundred twenty-three million, seven hundred forty-two thousand, seven hundred eighty-nine".