2865649 has 4 divisors (see below), whose sum is σ = 2932336. Its totient is φ = 2798964.

The previous prime is 2865641. The next prime is 2865659. The reversal of 2865649 is 9465682.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9465682 = 2 ⋅4732841.

It is a cyclic number.

It is not a de Polignac number, because 2865649 - 2³ = 2865641 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2865641) 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, 33279 + ... + 33364.

It is an arithmetic number, because the mean of its divisors is an integer number (733084).

2^2865649 is an apocalyptic number.

It is an amenable number.

2865649 is a deficient number, since it is larger than the sum of its proper divisors (66687).

2865649 is an equidigital number, since it uses as much as digits as its factorization.

2865649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66686.

The product of its digits is 103680, while the sum is 40.

The square root of 2865649 is about 1692.8227904893. The cubic root of 2865649 is about 142.0390192316.

The spelling of 2865649 in words is "two million, eight hundred sixty-five thousand, six hundred forty-nine".