39805697 has 2 divisors, whose sum is σ = 39805698. Its totient is φ = 39805696.

The previous prime is 39805691. The next prime is 39805699. The reversal of 39805697 is 79650893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33535681 + 6270016 = 5791^2 + 2504^2 .

It is a cyclic number.

It is not a de Polignac number, because 39805697 - 2⁴ = 39805681 is a prime.

Together with 39805699, 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 (39805691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19902848 + 19902849.

It is an arithmetic number, because the mean of its divisors is an integer number (19902849).

Almost surely, 2^39805697 is an apocalyptic number.

It is an amenable number.

39805697 is a deficient number, since it is larger than the sum of its proper divisors (1).

39805697 is an equidigital number, since it uses as much as digits as its factorization.

39805697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 39805697 is about 6309.1756196828. The cubic root of 39805697 is about 341.4405345104.

The spelling of 39805697 in words is "thirty-nine million, eight hundred five thousand, six hundred ninety-seven".