9400381 has 2 divisors, whose sum is σ = 9400382. Its totient is φ = 9400380.

The previous prime is 9400361. The next prime is 9400387. The reversal of 9400381 is 1830049.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9400356 + 25 = 3066^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 9400381 - 2⁷ = 9400253 is a prime.

It is a super-2 number, since 2×9400381² = 176734325890322, which contains 22 as substring.

9400381 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9400387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4700190 + 4700191.

It is an arithmetic number, because the mean of its divisors is an integer number (4700191).

Almost surely, 2^9400381 is an apocalyptic number.

It is an amenable number.

9400381 is a deficient number, since it is larger than the sum of its proper divisors (1).

9400381 is an equidigital number, since it uses as much as digits as its factorization.

9400381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 9400381 is about 3066.0040769705. The cubic root of 9400381 is about 211.0482807690.

Subtracting from 9400381 its sum of digits (25), we obtain a square (9400356 = 3066²).

The spelling of 9400381 in words is "nine million, four hundred thousand, three hundred eighty-one".