2009749 has 4 divisors (see below), whose sum is σ = 2296864. Its totient is φ = 1722636.

The previous prime is 2009747. The next prime is 2009759. The reversal of 2009749 is 9479002.

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 not a de Polignac number, because 2009749 - 2¹ = 2009747 is a prime.

It is a Duffinian number.

2009749 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2009749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2009747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143547 + ... + 143560.

It is an arithmetic number, because the mean of its divisors is an integer number (574216).

2^2009749 is an apocalyptic number.

It is an amenable number.

2009749 is a deficient number, since it is larger than the sum of its proper divisors (287115).

2009749 is an equidigital number, since it uses as much as digits as its factorization.

2009749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287114.

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

The square root of 2009749 is about 1417.6561642373. The cubic root of 2009749 is about 126.1964894296.

The spelling of 2009749 in words is "two million, nine thousand, seven hundred forty-nine".