39749 has 2 divisors, whose sum is σ = 39750. Its totient is φ = 39748.

The previous prime is 39733. The next prime is 39761. The reversal of 39749 is 94793.

It is a happy number.

39749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37249 + 2500 = 193^2 + 50^2 .

It is an emirp because it is prime and its reverse (94793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39749 - 2⁴ = 39733 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 39749.

It is not a weakly prime, because it can be changed into another prime (39709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19874 + 19875.

It is an arithmetic number, because the mean of its divisors is an integer number (19875).

2³⁹⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

39749 is a deficient number, since it is larger than the sum of its proper divisors (1).

39749 is an equidigital number, since it uses as much as digits as its factorization.

39749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 32.

The square root of 39749 is about 199.3715125087. The cubic root of 39749 is about 34.1278347907.

The spelling of 39749 in words is "thirty-nine thousand, seven hundred forty-nine".