12400145 has 16 divisors (see below), whose sum is σ = 15392592. Its totient is φ = 9584640.

The previous prime is 12400127. The next prime is 12400169. The reversal of 12400145 is 54100421.

12400145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1164241 + 11235904 = 1079^2 + 3352^2 .

It is not a de Polignac number, because 12400145 - 2¹² = 12396049 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, 19025 + ... + 19665.

It is an arithmetic number, because the mean of its divisors is an integer number (962037).

Almost surely, 2^12400145 is an apocalyptic number.

It is an amenable number.

12400145 is a deficient number, since it is larger than the sum of its proper divisors (2992447).

12400145 is an equidigital number, since it uses as much as digits as its factorization.

12400145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 12400145 is about 3521.3839608881. The cubic root of 12400145 is about 231.4598076410.

Adding to 12400145 its reverse (54100421), we get a palindrome (66500566).

The spelling of 12400145 in words is "twelve million, four hundred thousand, one hundred forty-five".