39968197 has 2 divisors, whose sum is σ = 39968198. Its totient is φ = 39968196.

The previous prime is 39968161. The next prime is 39968219. The reversal of 39968197 is 79186993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28718881 + 11249316 = 5359^2 + 3354^2 .

It is a cyclic number.

It is not a de Polignac number, because 39968197 - 2¹¹ = 39966149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39968107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19984098 + 19984099.

It is an arithmetic number, because the mean of its divisors is an integer number (19984099).

Almost surely, 2^39968197 is an apocalyptic number.

It is an amenable number.

39968197 is a deficient number, since it is larger than the sum of its proper divisors (1).

39968197 is an equidigital number, since it uses as much as digits as its factorization.

39968197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 52.

The square root of 39968197 is about 6322.0405724734. The cubic root of 39968197 is about 341.9045280285.

Subtracting 39968197 from its reverse (79186993), we obtain a triangular number (39218796 = T₈₈₅₆).

The spelling of 39968197 in words is "thirty-nine million, nine hundred sixty-eight thousand, one hundred ninety-seven".