2049665 has 4 divisors (see below), whose sum is σ = 2459604. Its totient is φ = 1639728.

The previous prime is 2049659. The next prime is 2049667. The reversal of 2049665 is 5669402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5669402 = 2 ⋅2834701.

It can be written as a sum of positive squares in 2 ways, for example, as 246016 + 1803649 = 496^2 + 1343^2 .

It is a cyclic number.

It is not a de Polignac number, because 2049665 - 2⁸ = 2049409 is a prime.

It is a super-2 number, since 2×2049665² = 8402253224450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2049667) 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, 204962 + ... + 204971.

It is an arithmetic number, because the mean of its divisors is an integer number (614901).

2^2049665 is an apocalyptic number.

It is an amenable number.

2049665 is a deficient number, since it is larger than the sum of its proper divisors (409939).

2049665 is an equidigital number, since it uses as much as digits as its factorization.

2049665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409938.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 2049665 is about 1431.6651144734. The cubic root of 2049665 is about 127.0264891943.

The spelling of 2049665 in words is "two million, forty-nine thousand, six hundred sixty-five".