381428 has 12 divisors (see below), whose sum is σ = 672672. Its totient is φ = 189240.

The previous prime is 381419. The next prime is 381439. The reversal of 381428 is 824183.

It is a junction number, because it is equal to n+sod(n) for n = 381397 and 381406.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 381428.

It is an unprimeable number.

381428 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383 + ... + 953.

It is an arithmetic number, because the mean of its divisors is an integer number (56056).

2³⁸¹⁴²⁸ is an apocalyptic number.

It is an amenable number.

381428 is a deficient number, since it is larger than the sum of its proper divisors (291244).

381428 is a wasteful number, since it uses less digits than its factorization.

381428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742 (or 740 counting only the distinct ones).

The product of its digits is 1536, while the sum is 26.

The square root of 381428 is about 617.5985751279. The cubic root of 381428 is about 72.5221810847.

The spelling of 381428 in words is "three hundred eighty-one thousand, four hundred twenty-eight".