378865 has 4 divisors (see below), whose sum is σ = 454644. Its totient is φ = 303088.

The previous prime is 378823. The next prime is 378869. The reversal of 378865 is 568873.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 568873 = 223 ⋅2551.

It can be written as a sum of positive squares in 2 ways, for example, as 47089 + 331776 = 217^2 + 576^2 .

It is a cyclic number.

It is not a de Polignac number, because 378865 - 2⁹ = 378353 is a prime.

It is a Duffinian number.

378865 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (378869) 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, 37882 + ... + 37891.

It is an arithmetic number, because the mean of its divisors is an integer number (113661).

2³⁷⁸⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

378865 is a deficient number, since it is larger than the sum of its proper divisors (75779).

378865 is an equidigital number, since it uses as much as digits as its factorization.

378865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75778.

The product of its digits is 40320, while the sum is 37.

The square root of 378865 is about 615.5201052768. The cubic root of 378865 is about 72.3593786353.

The spelling of 378865 in words is "three hundred seventy-eight thousand, eight hundred sixty-five".