2809949 has 4 divisors (see below), whose sum is σ = 2816736. Its totient is φ = 2803164.

The previous prime is 2809931. The next prime is 2809973. The reversal of 2809949 is 9499082.

2809949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2809949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2809249) 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 3 ways as a sum of consecutive naturals, for example, 2729 + ... + 3614.

It is an arithmetic number, because the mean of its divisors is an integer number (704184).

2^2809949 is an apocalyptic number.

It is an amenable number.

2809949 is a deficient number, since it is larger than the sum of its proper divisors (6787).

2809949 is an equidigital number, since it uses as much as digits as its factorization.

2809949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6786.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 2809949 is about 1676.2902493303. The cubic root of 2809949 is about 141.1127143931.

The spelling of 2809949 in words is "two million, eight hundred nine thousand, nine hundred forty-nine".