2161838 has 8 divisors (see below), whose sum is σ = 3706032. Its totient is φ = 926496.

The previous prime is 2161829. The next prime is 2161843. The reversal of 2161838 is 8381612.

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

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 2161838.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77195 + ... + 77222.

It is an arithmetic number, because the mean of its divisors is an integer number (463254).

2^2161838 is an apocalyptic number.

2161838 is a deficient number, since it is larger than the sum of its proper divisors (1544194).

2161838 is a wasteful number, since it uses less digits than its factorization.

2161838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154426.

The product of its digits is 2304, while the sum is 29.

The square root of 2161838 is about 1470.3190130036. The cubic root of 2161838 is about 129.3027362937.

The spelling of 2161838 in words is "two million, one hundred sixty-one thousand, eight hundred thirty-eight".