3938749 has 4 divisors (see below), whose sum is σ = 3943836. Its totient is φ = 3933664.

The previous prime is 3938743. The next prime is 3938771. The reversal of 3938749 is 9478393.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9478393 = 73 ⋅129841.

It can be written as a sum of positive squares in 2 ways, for example, as 2295225 + 1643524 = 1515^2 + 1282^2 .

It is a cyclic number.

It is not a de Polignac number, because 3938749 - 2⁵ = 3938717 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 (3938743) 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, 1114 + ... + 3019.

It is an arithmetic number, because the mean of its divisors is an integer number (985959).

Almost surely, 2^3938749 is an apocalyptic number.

It is an amenable number.

3938749 is a deficient number, since it is larger than the sum of its proper divisors (5087).

3938749 is an equidigital number, since it uses as much as digits as its factorization.

3938749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5086.

The product of its digits is 163296, while the sum is 43.

The square root of 3938749 is about 1984.6281767626. The cubic root of 3938749 is about 157.9256847544.

The spelling of 3938749 in words is "three million, nine hundred thirty-eight thousand, seven hundred forty-nine".