39725657 has 2 divisors, whose sum is σ = 39725658. Its totient is φ = 39725656.

The previous prime is 39725633. The next prime is 39725659. The reversal of 39725657 is 75652793.

39725657 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., 37810201 + 1915456 = 6149^2 + 1384^2 .

It is a cyclic number.

It is not a de Polignac number, because 39725657 - 2¹⁴ = 39709273 is a prime.

Together with 39725659, 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 (39725659) 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 as a sum of consecutive naturals, namely, 19862828 + 19862829.

It is an arithmetic number, because the mean of its divisors is an integer number (19862829).

Almost surely, 2^39725657 is an apocalyptic number.

It is an amenable number.

39725657 is a deficient number, since it is larger than the sum of its proper divisors (1).

39725657 is an equidigital number, since it uses as much as digits as its factorization.

39725657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 396900, while the sum is 44.

The square root of 39725657 is about 6302.8292853289. The cubic root of 39725657 is about 341.2115284444.

The spelling of 39725657 in words is "thirty-nine million, seven hundred twenty-five thousand, six hundred fifty-seven".