4239749 has 4 divisors (see below), whose sum is σ = 4489164. Its totient is φ = 3990336.

The previous prime is 4239743. The next prime is 4239761. The reversal of 4239749 is 9479324.

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 2951524 + 1288225 = 1718^2 + 1135^2 .

It is a cyclic number.

It is not a de Polignac number, because 4239749 - 2⁴ = 4239733 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 (4239743) 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, 124682 + ... + 124715.

It is an arithmetic number, because the mean of its divisors is an integer number (1122291).

Almost surely, 2^4239749 is an apocalyptic number.

It is an amenable number.

4239749 is a deficient number, since it is larger than the sum of its proper divisors (249415).

4239749 is a wasteful number, since it uses less digits than its factorization.

4239749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249414.

The product of its digits is 54432, while the sum is 38.

The square root of 4239749 is about 2059.0650791075. The cubic root of 4239749 is about 161.8502528221.

The spelling of 4239749 in words is "four million, two hundred thirty-nine thousand, seven hundred forty-nine".