2185878 has 8 divisors (see below), whose sum is σ = 4371768. Its totient is φ = 728624.

The previous prime is 2185873. The next prime is 2185889. The reversal of 2185878 is 8785812.

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

2185878 is an admirable number.

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 (2185871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182151 + ... + 182162.

It is an arithmetic number, because the mean of its divisors is an integer number (546471).

2^2185878 is an apocalyptic number.

2185878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2185878 is a wasteful number, since it uses less digits than its factorization.

2185878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364318.

The product of its digits is 35840, while the sum is 39.

The square root of 2185878 is about 1478.4715080109. The cubic root of 2185878 is about 129.7802599446.

The spelling of 2185878 in words is "two million, one hundred eighty-five thousand, eight hundred seventy-eight".