2381643 has 30 divisors (see below), whose sum is σ = 3926692. Its totient is φ = 1443420.

The previous prime is 2381633. The next prime is 2381651. The reversal of 2381643 is 3461832.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

2381643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2381643 - 2⁸ = 2381387 is a prime.

It is a super-3 number, since 3×2381643³ = 40527633318303164121, which contains 333 as substring.

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

It is a nialpdrome in base 3 and base 9.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (2381633) 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 29 ways as a sum of consecutive naturals, for example, 216508 + ... + 216518.

2^2381643 is an apocalyptic number.

2381643 is a deficient number, since it is larger than the sum of its proper divisors (1545049).

2381643 is an frugal number, since it uses more digits than its factorization.

2381643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49 (or 14 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 2381643 is about 1543.2572695439. The cubic root of 2381643 is about 133.5443609677.

Multiplying 2381643 by its sum of digits (27), we get a square (64304361 = 8019²).

2381643 divided by its sum of digits (27) gives a square (88209 = 297²).

It can be divided in two parts, 238 and 1643, that added together give a palindrome (1881).

The spelling of 2381643 in words is "two million, three hundred eighty-one thousand, six hundred forty-three".