123666841 has 4 divisors (see below), whose sum is σ = 123697332. Its totient is φ = 123636352.

The previous prime is 123666833. The next prime is 123666853. The reversal of 123666841 is 148666321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55950400 + 67716441 = 7480^2 + 8229^2 .

It is a cyclic number.

It is not a de Polignac number, because 123666841 - 2³ = 123666833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123666841.

It is not an unprimeable number, because it can be changed into a prime (123666341) 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, 8020 + ... + 17653.

It is an arithmetic number, because the mean of its divisors is an integer number (30924333).

Almost surely, 2^123666841 is an apocalyptic number.

It is an amenable number.

123666841 is a deficient number, since it is larger than the sum of its proper divisors (30491).

123666841 is an equidigital number, since it uses as much as digits as its factorization.

123666841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30490.

The product of its digits is 41472, while the sum is 37.

The square root of 123666841 is about 11120.5593834123. The cubic root of 123666841 is about 498.2160976205.

The spelling of 123666841 in words is "one hundred twenty-three million, six hundred sixty-six thousand, eight hundred forty-one".