12398381 has 2 divisors, whose sum is σ = 12398382. Its totient is φ = 12398380.

The previous prime is 12398371. The next prime is 12398413. The reversal of 12398381 is 18389321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11526025 + 872356 = 3395^2 + 934^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12398381 is a prime.

It is a super-2 number, since 2×12398381² = 307439702842322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12398371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6199190 + 6199191.

It is an arithmetic number, because the mean of its divisors is an integer number (6199191).

Almost surely, 2^12398381 is an apocalyptic number.

It is an amenable number.

12398381 is a deficient number, since it is larger than the sum of its proper divisors (1).

12398381 is an equidigital number, since it uses as much as digits as its factorization.

12398381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 12398381 is about 3521.1334822753. The cubic root of 12398381 is about 231.4488315741.

The spelling of 12398381 in words is "twelve million, three hundred ninety-eight thousand, three hundred eighty-one".