2078921 has 8 divisors (see below), whose sum is σ = 2291520. Its totient is φ = 1873872.

The previous prime is 2078917. The next prime is 2078927. The reversal of 2078921 is 1298702.

It is a happy number.

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

It is not a de Polignac number, because 2078921 - 2² = 2078917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2078927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1301 + ... + 2418.

It is an arithmetic number, because the mean of its divisors is an integer number (286440).

2^2078921 is an apocalyptic number.

It is an amenable number.

2078921 is a deficient number, since it is larger than the sum of its proper divisors (212599).

2078921 is a wasteful number, since it uses less digits than its factorization.

2078921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3775.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 2078921 is about 1441.8463857152. The cubic root of 2078921 is about 127.6280093320.

The spelling of 2078921 in words is "two million, seventy-eight thousand, nine hundred twenty-one".