2018921 has 8 divisors (see below), whose sum is σ = 2162400. Its totient is φ = 1879200.

The previous prime is 2018899. The next prime is 2018927. The reversal of 2018921 is 1298102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2018921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2018927) 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, 221 + ... + 2021.

It is an arithmetic number, because the mean of its divisors is an integer number (270300).

2^2018921 is an apocalyptic number.

It is an amenable number.

2018921 is a deficient number, since it is larger than the sum of its proper divisors (143479).

2018921 is a wasteful number, since it uses less digits than its factorization.

2018921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1879.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 2018921 is about 1420.8873987758. The cubic root of 2018921 is about 126.3881747002.

The spelling of 2018921 in words is "two million, eighteen thousand, nine hundred twenty-one".