2028791 has 4 divisors (see below), whose sum is σ = 2048592. Its totient is φ = 2008992.

The previous prime is 2028781. The next prime is 2028809. The reversal of 2028791 is 1978202.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2028791 - 2¹⁴ = 2012407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2028701) 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, 9746 + ... + 9951.

It is an arithmetic number, because the mean of its divisors is an integer number (512148).

2^2028791 is an apocalyptic number.

2028791 is a deficient number, since it is larger than the sum of its proper divisors (19801).

2028791 is a wasteful number, since it uses less digits than its factorization.

2028791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19800.

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

The square root of 2028791 is about 1424.3563458629. The cubic root of 2028791 is about 126.5938000419.

The spelling of 2028791 in words is "two million, twenty-eight thousand, seven hundred ninety-one".