378909 has 6 divisors (see below), whose sum is σ = 547326. Its totient is φ = 252600.

The previous prime is 378901. The next prime is 378919. The reversal of 378909 is 909873.

It can be written as a sum of positive squares in only one way, i.e., 356409 + 22500 = 597^2 + 150^2 .

It is not a de Polignac number, because 378909 - 2³ = 378901 is a prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 378909.

It is not an unprimeable number, because it can be changed into a prime (378901) 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, 21042 + ... + 21059.

It is an arithmetic number, because the mean of its divisors is an integer number (91221).

2³⁷⁸⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

378909 is a deficient number, since it is larger than the sum of its proper divisors (168417).

378909 is a wasteful number, since it uses less digits than its factorization.

378909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42107 (or 42104 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 378909 is about 615.5558463698. Note that the first 3 decimals coincide. The cubic root of 378909 is about 72.3621797117.

Subtracting from 378909 its sum of digits (36), we obtain a palindrome (378873).

The spelling of 378909 in words is "three hundred seventy-eight thousand, nine hundred nine".