2161867 has 8 divisors (see below), whose sum is σ = 2213120. Its totient is φ = 2111400.

The previous prime is 2161853. The next prime is 2161871. The reversal of 2161867 is 7681612.

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 2161867 - 2¹¹ = 2159819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161897) 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, 14242 + ... + 14392.

It is an arithmetic number, because the mean of its divisors is an integer number (276640).

2^2161867 is an apocalyptic number.

2161867 is a deficient number, since it is larger than the sum of its proper divisors (51253).

2161867 is a wasteful number, since it uses less digits than its factorization.

2161867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393.

The product of its digits is 4032, while the sum is 31.

The square root of 2161867 is about 1470.3288747760. The cubic root of 2161867 is about 129.3033144688.

The spelling of 2161867 in words is "two million, one hundred sixty-one thousand, eight hundred sixty-seven".