2028509 has 8 divisors (see below), whose sum is σ = 2331648. Its totient is φ = 1728720.

The previous prime is 2028503. The next prime is 2028511. The reversal of 2028509 is 9058202.

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

It is not a de Polignac number, because 2028509 - 2⁴ = 2028493 is a prime.

It is a super-2 number, since 2×2028509² = 8229697526162, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2028503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 644 + ... + 2114.

It is an arithmetic number, because the mean of its divisors is an integer number (291456).

2^2028509 is an apocalyptic number.

It is an amenable number.

2028509 is a deficient number, since it is larger than the sum of its proper divisors (303139).

2028509 is a wasteful number, since it uses less digits than its factorization.

2028509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 2028509 is about 1424.2573503409. The cubic root of 2028509 is about 126.5879342980.

The spelling of 2028509 in words is "two million, twenty-eight thousand, five hundred nine".