378689 has 6 divisors (see below), whose sum is σ = 400050. Its totient is φ = 358416.

The previous prime is 378683. The next prime is 378691. The reversal of 378689 is 986873.

It can be written as a sum of positive squares in only one way, i.e., 369664 + 9025 = 608^2 + 95^2 .

It is not a de Polignac number, because 378689 - 2¹⁶ = 313153 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 378689.

It is not an unprimeable number, because it can be changed into a prime (378683) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 164 + ... + 885.

It is an arithmetic number, because the mean of its divisors is an integer number (66675).

2³⁷⁸⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

378689 is a deficient number, since it is larger than the sum of its proper divisors (21361).

378689 is a wasteful number, since it uses less digits than its factorization.

378689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087 (or 1068 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The square root of 378689 is about 615.3771201467. The cubic root of 378689 is about 72.3481721606.

The spelling of 378689 in words is "three hundred seventy-eight thousand, six hundred eighty-nine".