39686369 has 2 divisors, whose sum is σ = 39686370. Its totient is φ = 39686368.

The previous prime is 39686341. The next prime is 39686389. The reversal of 39686369 is 96368693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39526369 + 160000 = 6287^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 39686369 - 2⁸ = 39686113 is a prime.

It is a super-2 number, since 2×39686369² = 3150015768808322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39686389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19843184 + 19843185.

It is an arithmetic number, because the mean of its divisors is an integer number (19843185).

Almost surely, 2^39686369 is an apocalyptic number.

It is an amenable number.

39686369 is a deficient number, since it is larger than the sum of its proper divisors (1).

39686369 is an equidigital number, since it uses as much as digits as its factorization.

39686369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1259712, while the sum is 50.

The square root of 39686369 is about 6299.7118188057. The cubic root of 39686369 is about 341.0990072071.

The spelling of 39686369 in words is "thirty-nine million, six hundred eighty-six thousand, three hundred sixty-nine".