39749249 has 2 divisors, whose sum is σ = 39749250. Its totient is φ = 39749248.

The previous prime is 39749239. The next prime is 39749251. The reversal of 39749249 is 94294793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37945600 + 1803649 = 6160^2 + 1343^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39749249 is a prime.

Together with 39749251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39749209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19874624 + 19874625.

It is an arithmetic number, because the mean of its divisors is an integer number (19874625).

Almost surely, 2^39749249 is an apocalyptic number.

It is an amenable number.

39749249 is a deficient number, since it is larger than the sum of its proper divisors (1).

39749249 is an equidigital number, since it uses as much as digits as its factorization.

39749249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 47.

The square root of 39749249 is about 6304.7005480038. The cubic root of 39749249 is about 341.2790605297.

The spelling of 39749249 in words is "thirty-nine million, seven hundred forty-nine thousand, two hundred forty-nine".