12390401 has 2 divisors, whose sum is σ = 12390402. Its totient is φ = 12390400.

The previous prime is 12390379. The next prime is 12390403. The reversal of 12390401 is 10409321.

It is a Cunningham number, because it is equal to 3520²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12390400 + 1 = 3520^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 12390401 - 2¹⁸ = 12128257 is a prime.

It is a Sophie Germain prime.

Together with 12390403, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12390403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6195200 + 6195201.

It is an arithmetic number, because the mean of its divisors is an integer number (6195201).

It is a Proth number, since it is equal to 3025 ⋅ 2¹² + 1 and 3025 < 2¹².

Almost surely, 2^12390401 is an apocalyptic number.

It is an amenable number.

12390401 is a deficient number, since it is larger than the sum of its proper divisors (1).

12390401 is an equidigital number, since it uses as much as digits as its factorization.

12390401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 12390401 is about 3520.0001420455. Note that the first 3 decimals coincide. The cubic root of 12390401 is about 231.3991649262.

Adding to 12390401 its reverse (10409321), we get a palindrome (22799722).

The spelling of 12390401 in words is "twelve million, three hundred ninety thousand, four hundred one".