74381 has 2 divisors, whose sum is σ = 74382. Its totient is φ = 74380.

The previous prime is 74377. The next prime is 74383. The reversal of 74381 is 18347.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62500 + 11881 = 250^2 + 109^2 .

It is a cyclic number.

It is not a de Polignac number, because 74381 - 2² = 74377 is a prime.

It is a super-2 number, since 2×74381² = 11065066322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 74383, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

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 (74383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37190 + 37191.

It is an arithmetic number, because the mean of its divisors is an integer number (37191).

2⁷⁴³⁸¹ is an apocalyptic number.

It is an amenable number.

74381 is a deficient number, since it is larger than the sum of its proper divisors (1).

74381 is an equidigital number, since it uses as much as digits as its factorization.

74381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 23.

The square root of 74381 is about 272.7288030260. The cubic root of 74381 is about 42.0552937639.

The spelling of 74381 in words is "seventy-four thousand, three hundred eighty-one".