23398381 has 2 divisors, whose sum is σ = 23398382. Its totient is φ = 23398380.

The previous prime is 23398379. The next prime is 23398391. The reversal of 23398381 is 18389332.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13942756 + 9455625 = 3734^2 + 3075^2 .

It is a cyclic number.

It is not a de Polignac number, because 23398381 - 2¹ = 23398379 is a prime.

It is a super-2 number, since 2×23398381² = 1094968466842322, which contains 22 as substring.

Together with 23398379, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 23398381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23398351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11699190 + 11699191.

It is an arithmetic number, because the mean of its divisors is an integer number (11699191).

Almost surely, 2^23398381 is an apocalyptic number.

It is an amenable number.

23398381 is a deficient number, since it is larger than the sum of its proper divisors (1).

23398381 is an equidigital number, since it uses as much as digits as its factorization.

23398381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 23398381 is about 4837.1873025551. The cubic root of 23398381 is about 286.0192539241.

The spelling of 23398381 in words is "twenty-three million, three hundred ninety-eight thousand, three hundred eighty-one".