381405 has 16 divisors (see below), whose sum is σ = 624384. Its totient is φ = 198720.

The previous prime is 381401. The next prime is 381413. The reversal of 381405 is 504183.

It is not a de Polignac number, because 381405 - 2² = 381401 is a prime.

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 381405.

It is not an unprimeable number, because it can be changed into a prime (381401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 435 + ... + 975.

It is an arithmetic number, because the mean of its divisors is an integer number (39024).

2³⁸¹⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

381405 is a deficient number, since it is larger than the sum of its proper divisors (242979).

381405 is a wasteful number, since it uses less digits than its factorization.

381405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 381405 is about 617.5799543379. The cubic root of 381405 is about 72.5207233664.

Adding to 381405 its reverse (504183), we get a palindrome (885588).

The spelling of 381405 in words is "three hundred eighty-one thousand, four hundred five".