381418 has 4 divisors (see below), whose sum is σ = 572130. Its totient is φ = 190708.

The previous prime is 381413. The next prime is 381419. The reversal of 381418 is 814183.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 380689 + 729 = 617^2 + 27^2 .

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 381392 and 381401.

It is not an unprimeable number, because it can be changed into a prime (381413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95353 + ... + 95356.

2³⁸¹⁴¹⁸ is an apocalyptic number.

381418 is a deficient number, since it is larger than the sum of its proper divisors (190712).

381418 is a wasteful number, since it uses less digits than its factorization.

381418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190711.

The product of its digits is 768, while the sum is 25.

The square root of 381418 is about 617.5904792012. The cubic root of 381418 is about 72.5215473013.

The spelling of 381418 in words is "three hundred eighty-one thousand, four hundred eighteen".