2790809 has 8 divisors (see below), whose sum is σ = 3200448. Its totient is φ = 2383920.

The previous prime is 2790779. The next prime is 2790841. The reversal of 2790809 is 9080972.

2790809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-2790809 is a prime.

It is a super-2 number, since 2×2790809² = 15577229748962, 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 (2790859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2474 + ... + 3420.

It is an arithmetic number, because the mean of its divisors is an integer number (400056).

2^2790809 is an apocalyptic number.

It is an amenable number.

2790809 is a deficient number, since it is larger than the sum of its proper divisors (409639).

2790809 is an equidigital number, since it uses as much as digits as its factorization.

2790809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 2790809 is about 1670.5714591121. The cubic root of 2790809 is about 140.7915872050.

The spelling of 2790809 in words is "two million, seven hundred ninety thousand, eight hundred nine".