123866217 has 12 divisors (see below), whose sum is σ = 179246340. Its totient is φ = 82425888.

The previous prime is 123866203. The next prime is 123866219. The reversal of 123866217 is 712668321.

123866217 is a `hidden beast` number, since 1 + 23 + 8 + 6 + 621 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 43243776 + 80622441 = 6576^2 + 8979^2 .

It is not a de Polignac number, because 123866217 - 2⁶ = 123866153 is a prime.

It is a super-3 number, since 3×123866217³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (123866219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7342 + ... + 17367.

It is an arithmetic number, because the mean of its divisors is an integer number (14937195).

Almost surely, 2^123866217 is an apocalyptic number.

It is an amenable number.

123866217 is a deficient number, since it is larger than the sum of its proper divisors (55380123).

123866217 is a wasteful number, since it uses less digits than its factorization.

123866217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25272 (or 25269 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 123866217 is about 11129.5200705152. The cubic root of 123866217 is about 498.4836956238.

The spelling of 123866217 in words is "one hundred twenty-three million, eight hundred sixty-six thousand, two hundred seventeen".