12400165 has 8 divisors (see below), whose sum is σ = 14956920. Its totient is φ = 9868992.

The previous prime is 12400127. The next prime is 12400169. The reversal of 12400165 is 56100421.

It can be written as a sum of positive squares in 4 ways, for example, as 1844164 + 10556001 = 1358^2 + 3249^2 .

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 12400165 - 2¹⁷ = 12269093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12400169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5310 + ... + 7279.

It is an arithmetic number, because the mean of its divisors is an integer number (1869615).

Almost surely, 2^12400165 is an apocalyptic number.

It is an amenable number.

12400165 is a deficient number, since it is larger than the sum of its proper divisors (2556755).

12400165 is a wasteful number, since it uses less digits than its factorization.

12400165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12791.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 12400165 is about 3521.3868006795. The cubic root of 12400165 is about 231.4599320803.

Adding to 12400165 its reverse (56100421), we get a palindrome (68500586).

The spelling of 12400165 in words is "twelve million, four hundred thousand, one hundred sixty-five".