381438 has 12 divisors (see below), whose sum is σ = 826488. Its totient is φ = 127140.
The previous prime is 381419. The next prime is 381439. The reversal of 381438 is 834183.
It is an alternating number because its digits alternate between odd and even.
It is a Curzon number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (381439) by changing a digit.
381438 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 5 ways as a sum of consecutive naturals, for example, 10578 + ... + 10613.
It is an arithmetic number, because the mean of its divisors is an integer number (68874).
2381438 is an apocalyptic number.
381438 is an abundant number, since it is smaller than the sum of its proper divisors (445050).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
381438 is a wasteful number, since it uses less digits than its factorization.
381438 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 21199 (or 21196 counting only the distinct ones).
The product of its digits is 2304, while the sum is 27.
The square root of 381438 is about 617.6066709484. The cubic root of 381438 is about 72.5228148569.
The spelling of 381438 in words is "three hundred eighty-one thousand, four hundred thirty-eight".
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