2190878 has 4 divisors (see below), whose sum is σ = 3286320. Its totient is φ = 1095438.

The previous prime is 2190857. The next prime is 2190887. The reversal of 2190878 is 8780912.

It is a happy number.

2190878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 547718 + ... + 547721.

It is an arithmetic number, because the mean of its divisors is an integer number (821580).

2^2190878 is an apocalyptic number.

2190878 is a deficient number, since it is larger than the sum of its proper divisors (1095442).

2190878 is a wasteful number, since it uses less digits than its factorization.

2190878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095441.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 2190878 is about 1480.1614776774. The cubic root of 2190878 is about 129.8791381619.

The spelling of 2190878 in words is "two million, one hundred ninety thousand, eight hundred seventy-eight".