2028991 has 8 divisors (see below), whose sum is σ = 2229120. Its totient is φ = 1838232.

The previous prime is 2028973. The next prime is 2029003. The reversal of 2028991 is 1998202.

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

It is a cyclic number.

It is not a de Polignac number, because 2028991 - 2⁷ = 2028863 is a prime.

It is a Duffinian number.

2028991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2028931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1885 + ... + 2758.

It is an arithmetic number, because the mean of its divisors is an integer number (278640).

2^2028991 is an apocalyptic number.

2028991 is a deficient number, since it is larger than the sum of its proper divisors (200129).

2028991 is a wasteful number, since it uses less digits than its factorization.

2028991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4685.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 2028991 is about 1424.4265512830. The cubic root of 2028991 is about 126.5979598146.

The spelling of 2028991 in words is "two million, twenty-eight thousand, nine hundred ninety-one".