2381821 has 8 divisors (see below), whose sum is σ = 2700320. Its totient is φ = 2082672.

The previous prime is 2381807. The next prime is 2381839. The reversal of 2381821 is 1281832.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2381821 - 2⁵ = 2381789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2381861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4575 + ... + 5068.

It is an arithmetic number, because the mean of its divisors is an integer number (337540).

2^2381821 is an apocalyptic number.

It is an amenable number.

2381821 is a deficient number, since it is larger than the sum of its proper divisors (318499).

2381821 is a wasteful number, since it uses less digits than its factorization.

2381821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9675.

The product of its digits is 768, while the sum is 25.

The square root of 2381821 is about 1543.3149386953. The cubic root of 2381821 is about 133.5476878453.

The spelling of 2381821 in words is "two million, three hundred eighty-one thousand, eight hundred twenty-one".