39947197 has 2 divisors, whose sum is σ = 39947198. Its totient is φ = 39947196.

The previous prime is 39947191. The next prime is 39947203. The reversal of 39947197 is 79174993.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (39947191) and next prime (39947203).

It can be written as a sum of positive squares in only one way, i.e., 38081241 + 1865956 = 6171^2 + 1366^2 .

It is a cyclic number.

It is not a de Polignac number, because 39947197 - 2¹⁹ = 39422909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39947197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39947191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19973598 + 19973599.

It is an arithmetic number, because the mean of its divisors is an integer number (19973599).

Almost surely, 2^39947197 is an apocalyptic number.

It is an amenable number.

39947197 is a deficient number, since it is larger than the sum of its proper divisors (1).

39947197 is an equidigital number, since it uses as much as digits as its factorization.

39947197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 49.

The square root of 39947197 is about 6320.3794980998. The cubic root of 39947197 is about 341.8446366358.

The spelling of 39947197 in words is "thirty-nine million, nine hundred forty-seven thousand, one hundred ninety-seven".