381406 has 8 divisors (see below), whose sum is σ = 602280. Its totient is φ = 180648.

The previous prime is 381401. The next prime is 381413. The reversal of 381406 is 604183.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 4981 + ... + 5056.

It is an arithmetic number, because the mean of its divisors is an integer number (75285).

2³⁸¹⁴⁰⁶ is an apocalyptic number.

381406 is a deficient number, since it is larger than the sum of its proper divisors (220874).

381406 is a wasteful number, since it uses less digits than its factorization.

381406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10058.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 381406 is about 617.5807639491. The cubic root of 381406 is about 72.5207867467.

Adding to 381406 its reverse (604183), we get a palindrome (985589).

It can be divided in two parts, 381 and 406, that added together give a palindrome (787).

The spelling of 381406 in words is "three hundred eighty-one thousand, four hundred six".