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381438 = 23221191
BaseRepresentation
bin1011101000111111110
3201101020100
41131013332
544201223
612101530
73146031
oct1350776
9641210
10381438
11240642
121648a6
13104805
149d018
1578043
hex5d1fe

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".

Divisors: 1 2 3 6 9 18 21191 42382 63573 127146 190719 381438