2028691 has 8 divisors (see below), whose sum is σ = 2327904. Its totient is φ = 1731840.

The previous prime is 2028679. The next prime is 2028701. The reversal of 2028691 is 1968202.

It is a happy number.

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 2028691 - 2⁹ = 2028179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2028601) 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, 2061 + ... + 2881.

It is an arithmetic number, because the mean of its divisors is an integer number (290988).

2^2028691 is an apocalyptic number.

2028691 is a deficient number, since it is larger than the sum of its proper divisors (299213).

2028691 is an equidigital number, since it uses as much as digits as its factorization.

2028691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 2028691 is about 1424.3212418552. The cubic root of 2028691 is about 126.5917200531.

The spelling of 2028691 in words is "two million, twenty-eight thousand, six hundred ninety-one".