2163878 has 4 divisors (see below), whose sum is σ = 3245820. Its totient is φ = 1081938.

The previous prime is 2163869. The next prime is 2163881. The reversal of 2163878 is 8783612.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540968 + ... + 540971.

It is an arithmetic number, because the mean of its divisors is an integer number (811455).

2^2163878 is an apocalyptic number.

2163878 is a deficient number, since it is larger than the sum of its proper divisors (1081942).

2163878 is a wasteful number, since it uses less digits than its factorization.

2163878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081941.

The product of its digits is 16128, while the sum is 35.

The square root of 2163878 is about 1471.0125764248. The cubic root of 2163878 is about 129.3433953155.

The spelling of 2163878 in words is "two million, one hundred sixty-three thousand, eight hundred seventy-eight".