18362381 has 2 divisors, whose sum is σ = 18362382. Its totient is φ = 18362380.

The previous prime is 18362371. The next prime is 18362411. The reversal of 18362381 is 18326381.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18361225 + 1156 = 4285^2 + 34^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18362381 is a prime.

It is a super-2 number, since 2×18362381² = 674354071978322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18362321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9181190 + 9181191.

It is an arithmetic number, because the mean of its divisors is an integer number (9181191).

Almost surely, 2^18362381 is an apocalyptic number.

It is an amenable number.

18362381 is a deficient number, since it is larger than the sum of its proper divisors (1).

18362381 is an equidigital number, since it uses as much as digits as its factorization.

18362381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The square root of 18362381 is about 4285.1348870251. The cubic root of 18362381 is about 263.8211838142.

The spelling of 18362381 in words is "eighteen million, three hundred sixty-two thousand, three hundred eighty-one".