2940809 has 4 divisors (see below), whose sum is σ = 2950404. Its totient is φ = 2931216.

The previous prime is 2940799. The next prime is 2940853. The reversal of 2940809 is 9080492.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1177225 + 1763584 = 1085^2 + 1328^2 .

It is a cyclic number.

It is not a de Polignac number, because 2940809 - 2⁴ = 2940793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2940409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4322 + ... + 4955.

It is an arithmetic number, because the mean of its divisors is an integer number (737601).

2^2940809 is an apocalyptic number.

It is an amenable number.

2940809 is a deficient number, since it is larger than the sum of its proper divisors (9595).

2940809 is an equidigital number, since it uses as much as digits as its factorization.

2940809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9594.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 2940809 is about 1714.8787129124. The cubic root of 2940809 is about 143.2701139386.

The spelling of 2940809 in words is "two million, nine hundred forty thousand, eight hundred nine".