381942 has 32 divisors (see below), whose sum is σ = 927360. Its totient is φ = 115560.

The previous prime is 381937. The next prime is 381943. The reversal of 381942 is 249183.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381943) by changing a digit.

381942 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 15 ways as a sum of consecutive naturals, for example, 273 + ... + 915.

It is an arithmetic number, because the mean of its divisors is an integer number (28980).

2³⁸¹⁹⁴² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (463680).

381942 is an abundant number, since it is smaller than the sum of its proper divisors (545418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381942 is a wasteful number, since it uses less digits than its factorization.

381942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665 (or 659 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 381942 is about 618.0145629352. The cubic root of 381942 is about 72.5547426423.

The spelling of 381942 in words is "three hundred eighty-one thousand, nine hundred forty-two".