39872197 has 2 divisors, whose sum is σ = 39872198. Its totient is φ = 39872196.

The previous prime is 39872167. The next prime is 39872201. The reversal of 39872197 is 79127893.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23824161 + 16048036 = 4881^2 + 4006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39872197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39872117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19936098 + 19936099.

It is an arithmetic number, because the mean of its divisors is an integer number (19936099).

Almost surely, 2^39872197 is an apocalyptic number.

It is an amenable number.

39872197 is a deficient number, since it is larger than the sum of its proper divisors (1).

39872197 is an equidigital number, since it uses as much as digits as its factorization.

39872197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 46.

The square root of 39872197 is about 6314.4435225917. The cubic root of 39872197 is about 341.6305673011.

The spelling of 39872197 in words is "thirty-nine million, eight hundred seventy-two thousand, one hundred ninety-seven".