2181850 has 24 divisors (see below), whose sum is σ = 4428288. Its totient is φ = 793200.

The previous prime is 2181833. The next prime is 2181857. The reversal of 2181850 is 581812.

It is a Harshad number since it is a multiple of its sum of digits (25).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1434 + ... + 2533.

It is an arithmetic number, because the mean of its divisors is an integer number (184512).

2^2181850 is an apocalyptic number.

2181850 is an abundant number, since it is smaller than the sum of its proper divisors (2246438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2181850 is a wasteful number, since it uses less digits than its factorization.

2181850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3990 (or 3985 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 2181850 is about 1477.1086622182. The cubic root of 2181850 is about 129.7004939320.

The spelling of 2181850 in words is "two million, one hundred eighty-one thousand, eight hundred fifty".