22378397 has 2 divisors, whose sum is σ = 22378398. Its totient is φ = 22378396.

The previous prime is 22378393. The next prime is 22378423. The reversal of 22378397 is 79387322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21771556 + 606841 = 4666^2 + 779^2 .

It is a cyclic number.

It is not a de Polignac number, because 22378397 - 2² = 22378393 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22378393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11189198 + 11189199.

It is an arithmetic number, because the mean of its divisors is an integer number (11189199).

Almost surely, 2^22378397 is an apocalyptic number.

It is an amenable number.

22378397 is a deficient number, since it is larger than the sum of its proper divisors (1).

22378397 is an equidigital number, since it uses as much as digits as its factorization.

22378397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 41.

The square root of 22378397 is about 4730.5810425359. The cubic root of 22378397 is about 281.8012994238.

The spelling of 22378397 in words is "twenty-two million, three hundred seventy-eight thousand, three hundred ninety-seven".