123666444 has 36 divisors (see below), whose sum is σ = 341020680. Its totient is φ = 37474560.

The previous prime is 123666443. The next prime is 123666457. The reversal of 123666444 is 444666321.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 123666399 and 123666408.

It is not an unprimeable number, because it can be changed into a prime (123666443) 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 in 11 ways as a sum of consecutive naturals, for example, 155749 + ... + 156540.

Almost surely, 2^123666444 is an apocalyptic number.

It is an amenable number.

123666444 is an abundant number, since it is smaller than the sum of its proper divisors (217354236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123666444 is a wasteful number, since it uses less digits than its factorization.

123666444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312310 (or 312305 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 123666444 is about 11120.5415335765. The cubic root of 123666444 is about 498.2155644892.

The spelling of 123666444 in words is "one hundred twenty-three million, six hundred sixty-six thousand, four hundred forty-four".