378857 has 4 divisors (see below), whose sum is σ = 380160. Its totient is φ = 377556.

The previous prime is 378823. The next prime is 378869. The reversal of 378857 is 758873.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 758873 = 523 ⋅1451.

It is a cyclic number.

It is not a de Polignac number, because 378857 - 2⁶ = 378793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 378857.

It is not an unprimeable number, because it can be changed into a prime (378817) 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, 8 + ... + 870.

It is an arithmetic number, because the mean of its divisors is an integer number (95040).

2³⁷⁸⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

378857 is a deficient number, since it is larger than the sum of its proper divisors (1303).

378857 is an equidigital number, since it uses as much as digits as its factorization.

378857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302.

The product of its digits is 47040, while the sum is 38.

The square root of 378857 is about 615.5136066733. The cubic root of 378857 is about 72.3588693254.

The spelling of 378857 in words is "three hundred seventy-eight thousand, eight hundred fifty-seven".