378281 has 4 divisors (see below), whose sum is σ = 394752. Its totient is φ = 361812.

The previous prime is 378277. The next prime is 378283. The reversal of 378281 is 182873.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 182873 = 23 ⋅7951.

It is a cyclic number.

It is not a de Polignac number, because 378281 - 2² = 378277 is a prime.

It is a super-2 number, since 2×378281² = 286193029922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (378283) 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, 8201 + ... + 8246.

It is an arithmetic number, because the mean of its divisors is an integer number (98688).

2³⁷⁸²⁸¹ is an apocalyptic number.

It is an amenable number.

378281 is a deficient number, since it is larger than the sum of its proper divisors (16471).

378281 is a wasteful number, since it uses less digits than its factorization.

378281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16470.

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

The square root of 378281 is about 615.0455267702. The cubic root of 378281 is about 72.3221801535.

The spelling of 378281 in words is "three hundred seventy-eight thousand, two hundred eighty-one".