2821609 has 16 divisors (see below), whose sum is σ = 3459456. Its totient is φ = 2246400.

The previous prime is 2821607. The next prime is 2821627. The reversal of 2821609 is 9061282.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2821609 - 2¹ = 2821607 is a prime.

It is a super-2 number, since 2×2821609² = 15922954697762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2821601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15499 + ... + 15679.

It is an arithmetic number, because the mean of its divisors is an integer number (216216).

2^2821609 is an apocalyptic number.

It is an amenable number.

2821609 is a deficient number, since it is larger than the sum of its proper divisors (637847).

2821609 is a wasteful number, since it uses less digits than its factorization.

2821609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336.

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

The square root of 2821609 is about 1679.7645668367. The cubic root of 2821609 is about 141.3076293936.

It can be divided in two parts, 282 and 1609, that added together give a triangular number (1891 = T₆₁).

The spelling of 2821609 in words is "two million, eight hundred twenty-one thousand, six hundred nine".