2161850 has 12 divisors (see below), whose sum is σ = 4021134. Its totient is φ = 864720.

The previous prime is 2161849. The next prime is 2161853. The reversal of 2161850 is 581612.

It can be written as a sum of positive squares in 3 ways, for example, as 958441 + 1203409 = 979^2 + 1097^2 .

It is an Ulam number.

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

It is not an unprimeable number, because it can be changed into a prime (2161853) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21569 + ... + 21668.

2^2161850 is an apocalyptic number.

2161850 is a deficient number, since it is larger than the sum of its proper divisors (1859284).

2161850 is a wasteful number, since it uses less digits than its factorization.

2161850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43249 (or 43244 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 2161850 is about 1470.3230937450. The cubic root of 2161850 is about 129.3029755392.

The spelling of 2161850 in words is "two million, one hundred sixty-one thousand, eight hundred fifty".