39900197 has 2 divisors, whose sum is σ = 39900198. Its totient is φ = 39900196.

The previous prime is 39900181. The next prime is 39900199. The reversal of 39900197 is 79100993.

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., 27552001 + 12348196 = 5249^2 + 3514^2 .

It is an emirp because it is prime and its reverse (79100993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39900197 - 2⁴ = 39900181 is a prime.

Together with 39900199, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39900197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39900199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19950098 + 19950099.

It is an arithmetic number, because the mean of its divisors is an integer number (19950099).

Almost surely, 2^39900197 is an apocalyptic number.

It is an amenable number.

39900197 is a deficient number, since it is larger than the sum of its proper divisors (1).

39900197 is an equidigital number, since it uses as much as digits as its factorization.

39900197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 39900197 is about 6316.6602726441. The cubic root of 39900197 is about 341.7105178960.

The spelling of 39900197 in words is "thirty-nine million, nine hundred thousand, one hundred ninety-seven".