123684817 has 2 divisors, whose sum is σ = 123684818. Its totient is φ = 123684816.

The previous prime is 123684787. The next prime is 123684839. The reversal of 123684817 is 718486321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92948881 + 30735936 = 9641^2 + 5544^2 .

It is a cyclic number.

It is not a de Polignac number, because 123684817 - 2¹⁵ = 123652049 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123684817.

It is not a weakly prime, because it can be changed into another prime (123684887) 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 as a sum of consecutive naturals, namely, 61842408 + 61842409.

It is an arithmetic number, because the mean of its divisors is an integer number (61842409).

Almost surely, 2^123684817 is an apocalyptic number.

It is an amenable number.

123684817 is a deficient number, since it is larger than the sum of its proper divisors (1).

123684817 is an equidigital number, since it uses as much as digits as its factorization.

123684817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 40.

The square root of 123684817 is about 11121.3675867674. The cubic root of 123684817 is about 498.2402363969.

The spelling of 123684817 in words is "one hundred twenty-three million, six hundred eighty-four thousand, eight hundred seventeen".