15972797 has 2 divisors, whose sum is σ = 15972798. Its totient is φ = 15972796.

The previous prime is 15972793. The next prime is 15972811. The reversal of 15972797 is 79727951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10374841 + 5597956 = 3221^2 + 2366^2 .

It is an emirp because it is prime and its reverse (79727951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15972797 - 2² = 15972793 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15972791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7986398 + 7986399.

It is an arithmetic number, because the mean of its divisors is an integer number (7986399).

Almost surely, 2^15972797 is an apocalyptic number.

It is an amenable number.

15972797 is a deficient number, since it is larger than the sum of its proper divisors (1).

15972797 is an equidigital number, since it uses as much as digits as its factorization.

15972797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 277830, while the sum is 47.

The square root of 15972797 is about 3996.5981784513. The cubic root of 15972797 is about 251.8413221683.

The spelling of 15972797 in words is "fifteen million, nine hundred seventy-two thousand, seven hundred ninety-seven".