380405 has 4 divisors (see below), whose sum is σ = 456492. Its totient is φ = 304320.

The previous prime is 380383. The next prime is 380417. The reversal of 380405 is 504083.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504083 = 53 ⋅9511.

It can be written as a sum of positive squares in 2 ways, for example, as 56644 + 323761 = 238^2 + 569^2 .

It is a de Polignac number, because none of the positive numbers 2^k-380405 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38036 + ... + 38045.

It is an arithmetic number, because the mean of its divisors is an integer number (114123).

2³⁸⁰⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

380405 is a deficient number, since it is larger than the sum of its proper divisors (76087).

380405 is an equidigital number, since it uses as much as digits as its factorization.

380405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76086.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 380405 is about 616.7698111938. The cubic root of 380405 is about 72.4572875644.

Adding to 380405 its reverse (504083), we get a palindrome (884488).

It can be divided in two parts, 3 and 80405, that added together give a palindrome (80408).

The spelling of 380405 in words is "three hundred eighty thousand, four hundred five".