123098665 has 4 divisors (see below), whose sum is σ = 147718404. Its totient is φ = 98478928.

The previous prime is 123098653. The next prime is 123098719. The reversal of 123098665 is 566890321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566890321 = 1499 ⋅378179.

It can be written as a sum of positive squares in 2 ways, for example, as 14167696 + 108930969 = 3764^2 + 10437^2 .

It is a cyclic number.

It is not a de Polignac number, because 123098665 - 2⁹ = 123098153 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12309862 + ... + 12309871.

It is an arithmetic number, because the mean of its divisors is an integer number (36929601).

Almost surely, 2^123098665 is an apocalyptic number.

It is an amenable number.

123098665 is a deficient number, since it is larger than the sum of its proper divisors (24619739).

123098665 is an equidigital number, since it uses as much as digits as its factorization.

123098665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24619738.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 123098665 is about 11094.9837764640. The cubic root of 123098665 is about 497.4519233358.

The spelling of 123098665 in words is "one hundred twenty-three million, ninety-eight thousand, six hundred sixty-five".