76381 has 4 divisors (see below), whose sum is σ = 80892. Its totient is φ = 71872.

The previous prime is 76379. The next prime is 76387. The reversal of 76381 is 18367.

76381 is nontrivially palindromic in base 15.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70756 + 5625 = 266^2 + 75^2 .

It is a cyclic number.

It is not a de Polignac number, because 76381 - 2¹ = 76379 is a prime.

It is a super-3 number, since 3×76381³ = 1336833360043023, which contains 333 as substring. Note that it is a super-d number also for d = 2.

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

It is a Duffinian number.

76381 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2230 + ... + 2263.

It is an arithmetic number, because the mean of its divisors is an integer number (20223).

2⁷⁶³⁸¹ is an apocalyptic number.

It is an amenable number.

76381 is a deficient number, since it is larger than the sum of its proper divisors (4511).

76381 is a wasteful number, since it uses less digits than its factorization.

76381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510.

The product of its digits is 1008, while the sum is 25.

The square root of 76381 is about 276.3711272908. The cubic root of 76381 is about 42.4289007305.

The spelling of 76381 in words is "seventy-six thousand, three hundred eighty-one".