123299965 has 4 divisors (see below), whose sum is σ = 147959964. Its totient is φ = 98639968.

The previous prime is 123299959. The next prime is 123299983. The reversal of 123299965 is 569992321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 569992321 = 421 ⋅1353901.

It can be written as a sum of positive squares in 2 ways, for example, as 28879876 + 94420089 = 5374^2 + 9717^2 .

It is a cyclic number.

It is not a de Polignac number, because 123299965 - 2¹⁹ = 122775677 is a prime.

It is a Duffinian number.

It is a congruent 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, 12329992 + ... + 12330001.

It is an arithmetic number, because the mean of its divisors is an integer number (36989991).

Almost surely, 2^123299965 is an apocalyptic number.

It is an amenable number.

123299965 is a deficient number, since it is larger than the sum of its proper divisors (24659999).

123299965 is an equidigital number, since it uses as much as digits as its factorization.

123299965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24659998.

The product of its digits is 262440, while the sum is 46.

The square root of 123299965 is about 11104.0517379919. The cubic root of 123299965 is about 497.7229323346.

The spelling of 123299965 in words is "one hundred twenty-three million, two hundred ninety-nine thousand, nine hundred sixty-five".