842381 has 4 divisors (see below), whose sum is σ = 860352. Its totient is φ = 824412.

The previous prime is 842371. The next prime is 842383. The reversal of 842381 is 183248.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 842381 - 2¹⁴ = 825997 is a prime.

It is a super-2 number, since 2×842381² = 1419211498322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 842381.

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 842381.

It is not an unprimeable number, because it can be changed into a prime (842383) 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 in 3 ways as a sum of consecutive naturals, for example, 8915 + ... + 9008.

It is an arithmetic number, because the mean of its divisors is an integer number (215088).

2⁸⁴²³⁸¹ is an apocalyptic number.

It is an amenable number.

842381 is a deficient number, since it is larger than the sum of its proper divisors (17971).

842381 is a wasteful number, since it uses less digits than its factorization.

842381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17970.

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

The square root of 842381 is about 917.8131618145. The cubic root of 842381 is about 94.4429449461.

The spelling of 842381 in words is "eight hundred forty-two thousand, three hundred eighty-one".