2161826 has 4 divisors (see below), whose sum is σ = 3242742. Its totient is φ = 1080912.

The previous prime is 2161823. The next prime is 2161829. The reversal of 2161826 is 6281612.

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

It is an interprime number because it is at equal distance from previous prime (2161823) and next prime (2161829).

It can be written as a sum of positive squares in only one way, i.e., 1692601 + 469225 = 1301^2 + 685^2 .

It is a d-powerful number, because it can be written as 2¹¹ + 1 + 6⁵ + 1 + 8⁷ + 2¹³ + 6⁶ .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2161795 and 2161804.

It is not an unprimeable number, because it can be changed into a prime (2161823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540455 + ... + 540458.

2^2161826 is an apocalyptic number.

2161826 is a deficient number, since it is larger than the sum of its proper divisors (1080916).

2161826 is a wasteful number, since it uses less digits than its factorization.

2161826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080915.

The product of its digits is 1152, while the sum is 26.

The square root of 2161826 is about 1470.3149322509. The cubic root of 2161826 is about 129.3024970473.

The spelling of 2161826 in words is "two million, one hundred sixty-one thousand, eight hundred twenty-six".