381278 has 4 divisors (see below), whose sum is σ = 571920. Its totient is φ = 190638.

The previous prime is 381253. The next prime is 381287. The reversal of 381278 is 872183.

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

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 381278.

It is a congruent number.

It is an unprimeable number.

381278 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 95318 + ... + 95321.

It is an arithmetic number, because the mean of its divisors is an integer number (142980).

2³⁸¹²⁷⁸ is an apocalyptic number.

381278 is a deficient number, since it is larger than the sum of its proper divisors (190642).

381278 is a wasteful number, since it uses less digits than its factorization.

381278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190641.

The product of its digits is 2688, while the sum is 29.

The square root of 381278 is about 617.4771250824. The cubic root of 381278 is about 72.5126731710.

The spelling of 381278 in words is "three hundred eighty-one thousand, two hundred seventy-eight".