2381009 has 4 divisors (see below), whose sum is σ = 2385204. Its totient is φ = 2376816.

The previous prime is 2380997. The next prime is 2381011. The reversal of 2381009 is 9001832.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2334784 + 46225 = 1528^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 2381009 - 2²⁰ = 1332433 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2381089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1082 + ... + 2435.

It is an arithmetic number, because the mean of its divisors is an integer number (596301).

2^2381009 is an apocalyptic number.

It is an amenable number.

2381009 is a deficient number, since it is larger than the sum of its proper divisors (4195).

2381009 is an equidigital number, since it uses as much as digits as its factorization.

2381009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4194.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 2381009 is about 1543.0518461802. The cubic root of 2381009 is about 133.5325099558.

The spelling of 2381009 in words is "two million, three hundred eighty-one thousand, nine".