2049709 has 4 divisors (see below), whose sum is σ = 2052604. Its totient is φ = 2046816.

The previous prime is 2049703. The next prime is 2049721. The reversal of 2049709 is 9079402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9079402 = 2 ⋅4539701.

It can be written as a sum of positive squares in 2 ways, for example, as 1108809 + 940900 = 1053^2 + 970^2 .

It is a cyclic number.

It is not a de Polignac number, because 2049709 - 2¹⁹ = 1525421 is a prime.

It is a Duffinian number.

2049709 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2049703) 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, 409 + ... + 2065.

It is an arithmetic number, because the mean of its divisors is an integer number (513151).

2^2049709 is an apocalyptic number.

It is an amenable number.

2049709 is a deficient number, since it is larger than the sum of its proper divisors (2895).

2049709 is a wasteful number, since it uses less digits than its factorization.

2049709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2894.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 2049709 is about 1431.6804811130. The cubic root of 2049709 is about 127.0273981437.

It can be divided in two parts, 20 and 49709, that added together give a square (49729 = 223²).

The spelling of 2049709 in words is "two million, forty-nine thousand, seven hundred nine".