378561 has 8 divisors (see below), whose sum is σ = 507744. Its totient is φ = 250880.

The previous prime is 378559. The next prime is 378569. The reversal of 378561 is 165873.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 2-Lehmer number, since φ(378561) divides (378561-1)².

It is a cyclic number.

It is not a de Polignac number, because 378561 - 2¹ = 378559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (378569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 526 + ... + 1016.

It is an arithmetic number, because the mean of its divisors is an integer number (63468).

2³⁷⁸⁵⁶¹ is an apocalyptic number.

It is an amenable number.

378561 is a deficient number, since it is larger than the sum of its proper divisors (129183).

378561 is a wasteful number, since it uses less digits than its factorization.

378561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751.

The product of its digits is 5040, while the sum is 30.

The square root of 378561 is about 615.2731100901. The cubic root of 378561 is about 72.3400198160.

It can be divided in two parts, 378 and 561, that added together give a palindrome (939).

The spelling of 378561 in words is "three hundred seventy-eight thousand, five hundred sixty-one".