39985697 has 2 divisors, whose sum is σ = 39985698. Its totient is φ = 39985696.

The previous prime is 39985643. The next prime is 39985711. The reversal of 39985697 is 79658993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37957921 + 2027776 = 6161^2 + 1424^2 .

It is a cyclic number.

It is not a de Polignac number, because 39985697 - 2⁸ = 39985441 is a prime.

It is not a weakly prime, because it can be changed into another prime (39985607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19992848 + 19992849.

It is an arithmetic number, because the mean of its divisors is an integer number (19992849).

Almost surely, 2^39985697 is an apocalyptic number.

It is an amenable number.

39985697 is a deficient number, since it is larger than the sum of its proper divisors (1).

39985697 is an equidigital number, since it uses as much as digits as its factorization.

39985697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3674160, while the sum is 56.

The square root of 39985697 is about 6323.4244678022. The cubic root of 39985697 is about 341.9544214992.

The spelling of 39985697 in words is "thirty-nine million, nine hundred eighty-five thousand, six hundred ninety-seven".