123243665 has 8 divisors (see below), whose sum is σ = 148049640. Its totient is φ = 98490112.

The previous prime is 123243613. The next prime is 123243667. The reversal of 123243665 is 566342321.

It can be written as a sum of positive squares in 4 ways, for example, as 11751184 + 111492481 = 3428^2 + 10559^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123243665 - 2⁸ = 123243409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123243667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7730 + ... + 17499.

It is an arithmetic number, because the mean of its divisors is an integer number (18506205).

Almost surely, 2^123243665 is an apocalyptic number.

It is an amenable number.

123243665 is a deficient number, since it is larger than the sum of its proper divisors (24805975).

123243665 is an equidigital number, since it uses as much as digits as its factorization.

123243665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26211.

The product of its digits is 25920, while the sum is 32.

The square root of 123243665 is about 11101.5163378702. The cubic root of 123243665 is about 497.6471657081.

Adding to 123243665 its reverse (566342321), we get a palindrome (689585986).

The spelling of 123243665 in words is "one hundred twenty-three million, two hundred forty-three thousand, six hundred sixty-five".