12400173 has 12 divisors (see below), whose sum is σ = 17988828. Its totient is φ = 8231040.

The previous prime is 12400169. The next prime is 12400181. The reversal of 12400173 is 37100421.

It can be written as a sum of positive squares in 2 ways, for example, as 8311689 + 4088484 = 2883^2 + 2022^2 .

It is not a de Polignac number, because 12400173 - 2² = 12400169 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12400183) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 690 + ... + 5027.

It is an arithmetic number, because the mean of its divisors is an integer number (1499069).

Almost surely, 2^12400173 is an apocalyptic number.

It is an amenable number.

12400173 is a deficient number, since it is larger than the sum of its proper divisors (5588655).

12400173 is a wasteful number, since it uses less digits than its factorization.

12400173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5964 (or 5961 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 12400173 is about 3521.3879365955. The cubic root of 12400173 is about 231.4599818559.

Adding to 12400173 its reverse (37100421), we get a palindrome (49500594).

The spelling of 12400173 in words is "twelve million, four hundred thousand, one hundred seventy-three".