39649957 has 2 divisors, whose sum is σ = 39649958. Its totient is φ = 39649956.

The previous prime is 39649927. The next prime is 39649963. The reversal of 39649957 is 75994693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39513796 + 136161 = 6286^2 + 369^2 .

It is a cyclic number.

It is not a de Polignac number, because 39649957 - 2¹⁵ = 39617189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39649927) 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, 19824978 + 19824979.

It is an arithmetic number, because the mean of its divisors is an integer number (19824979).

Almost surely, 2^39649957 is an apocalyptic number.

It is an amenable number.

39649957 is a deficient number, since it is larger than the sum of its proper divisors (1).

39649957 is an equidigital number, since it uses as much as digits as its factorization.

39649957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1837080, while the sum is 52.

The square root of 39649957 is about 6296.8211821522. The cubic root of 39649957 is about 340.9946565383.

The spelling of 39649957 in words is "thirty-nine million, six hundred forty-nine thousand, nine hundred fifty-seven".