378409 has 4 divisors (see below), whose sum is σ = 380304. Its totient is φ = 376516.

The previous prime is 378407. The next prime is 378439. The reversal of 378409 is 904873.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 378409 - 2¹ = 378407 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

378409 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (378401) 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, 607 + ... + 1060.

It is an arithmetic number, because the mean of its divisors is an integer number (95076).

2³⁷⁸⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

378409 is a deficient number, since it is larger than the sum of its proper divisors (1895).

378409 is a wasteful number, since it uses less digits than its factorization.

378409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 378409 is about 615.1495753067. The cubic root of 378409 is about 72.3303365197.

It can be divided in two parts, 378 and 409, that added together give a palindrome (787).

The spelling of 378409 in words is "three hundred seventy-eight thousand, four hundred nine".