2649805 has 4 divisors (see below), whose sum is σ = 3179772. Its totient is φ = 2119840.

The previous prime is 2649799. The next prime is 2649811. The reversal of 2649805 is 5089462.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2649799) and next prime (2649811).

It can be written as a sum of positive squares in 2 ways, for example, as 835396 + 1814409 = 914^2 + 1347^2 .

It is not a de Polignac number, because 2649805 - 2⁷ = 2649677 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264976 + ... + 264985.

It is an arithmetic number, because the mean of its divisors is an integer number (794943).

2^2649805 is an apocalyptic number.

It is an amenable number.

2649805 is a deficient number, since it is larger than the sum of its proper divisors (529967).

2649805 is an equidigital number, since it uses as much as digits as its factorization.

2649805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529966.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 2649805 is about 1627.8221647342. The cubic root of 2649805 is about 138.3793559873.

The spelling of 2649805 in words is "two million, six hundred forty-nine thousand, eight hundred five".