276381 has 24 divisors (see below), whose sum is σ = 471744. Its totient is φ = 152640.

The previous prime is 276373. The next prime is 276389. The reversal of 276381 is 183672.

276381 is a `hidden beast` number, since 27 + 638 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (276373) and next prime (276389).

It is not a de Polignac number, because 276381 - 2³ = 276373 is a prime.

It is a super-3 number, since 3×276381³ = 63335296249843023, 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 even and odd.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 276381.

It is not an unprimeable number, because it can be changed into a prime (276389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2530 + ... + 2636.

It is an arithmetic number, because the mean of its divisors is an integer number (19656).

2²⁷⁶³⁸¹ is an apocalyptic number.

276381 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

276381 is a deficient number, since it is larger than the sum of its proper divisors (195363).

276381 is a wasteful number, since it uses less digits than its factorization.

276381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 158 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 276381 is about 525.7195069616. The cubic root of 276381 is about 65.1382461945.

The spelling of 276381 in words is "two hundred seventy-six thousand, three hundred eighty-one".