12400001 has 2 divisors, whose sum is σ = 12400002. Its totient is φ = 12400000.

The previous prime is 12399991. The next prime is 12400009. The reversal of 12400001 is 10000421.

12400001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (12400009) can be obtained adding 12400001 to its sum of digits (8).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9759376 + 2640625 = 3124^2 + 1625^2 .

It is a cyclic number.

It is not a de Polignac number, because 12400001 - 2¹⁸ = 12137857 is a prime.

It is not a weakly prime, because it can be changed into another prime (12400009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6200000 + 6200001.

It is an arithmetic number, because the mean of its divisors is an integer number (6200001).

Almost surely, 2^12400001 is an apocalyptic number.

It is an amenable number.

12400001 is a deficient number, since it is larger than the sum of its proper divisors (1).

12400001 is an equidigital number, since it uses as much as digits as its factorization.

12400001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 12400001 is about 3521.3635143223. The cubic root of 12400001 is about 231.4589116746.

Adding to 12400001 its reverse (10000421), we get a palindrome (22400422).

The spelling of 12400001 in words is "twelve million, four hundred thousand, one".