2381605 has 8 divisors (see below), whose sum is σ = 2867832. Its totient is φ = 1898688.

The previous prime is 2381591. The next prime is 2381609. The reversal of 2381605 is 5061832.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 401956 + 1979649 = 634^2 + 1407^2 .

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 2381605 - 2⁵ = 2381573 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2381605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2381609) 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, 1227 + ... + 2503.

It is an arithmetic number, because the mean of its divisors is an integer number (358479).

2^2381605 is an apocalyptic number.

It is an amenable number.

2381605 is a deficient number, since it is larger than the sum of its proper divisors (486227).

2381605 is a wasteful number, since it uses less digits than its factorization.

2381605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2381605 is about 1543.2449578729. The cubic root of 2381605 is about 133.5436507140.

The spelling of 2381605 in words is "two million, three hundred eighty-one thousand, six hundred five".