4009749 has 8 divisors (see below), whose sum is σ = 5426400. Its totient is φ = 2633136.

The previous prime is 4009729. The next prime is 4009769. The reversal of 4009749 is 9479004.

It is an interprime number because it is at equal distance from previous prime (4009729) and next prime (4009769).

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

It is not a de Polignac number, because 4009749 - 2⁹ = 4009237 is a prime.

4009749 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4009729) 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 7 ways as a sum of consecutive naturals, for example, 9774 + ... + 10175.

It is an arithmetic number, because the mean of its divisors is an integer number (678300).

Almost surely, 2^4009749 is an apocalyptic number.

It is an amenable number.

4009749 is a deficient number, since it is larger than the sum of its proper divisors (1416651).

4009749 is a wasteful number, since it uses less digits than its factorization.

4009749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20019.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 4009749 is about 2002.4357667601. The cubic root of 4009749 is about 158.8689636738.

The spelling of 4009749 in words is "four million, nine thousand, seven hundred forty-nine".