123320465 has 16 divisors (see below), whose sum is σ = 158315472. Its totient is φ = 91889664.

The previous prime is 123320459. The next prime is 123320471. The reversal of 123320465 is 564023321.

It is an interprime number because it is at equal distance from previous prime (123320459) and next prime (123320471).

It can be written as a sum of positive squares in 8 ways, for example, as 753424 + 122567041 = 868^2 + 11071^2 .

It is a cyclic number.

It is not a de Polignac number, because 123320465 - 2¹⁸ = 123058321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 767 + ... + 15723.

It is an arithmetic number, because the mean of its divisors is an integer number (9894717).

Almost surely, 2^123320465 is an apocalyptic number.

It is an amenable number.

123320465 is a deficient number, since it is larger than the sum of its proper divisors (34995007).

123320465 is a wasteful number, since it uses less digits than its factorization.

123320465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15076.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 123320465 is about 11104.9747861037. The cubic root of 123320465 is about 497.7505148098.

Adding to 123320465 its reverse (564023321), we get a palindrome (687343786).

The spelling of 123320465 in words is "one hundred twenty-three million, three hundred twenty thousand, four hundred sixty-five".