19916797 has 2 divisors, whose sum is σ = 19916798. Its totient is φ = 19916796.

The previous prime is 19916791. The next prime is 19916803. The reversal of 19916797 is 79761991.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (19916791) and next prime (19916803).

It can be written as a sum of positive squares in only one way, i.e., 12809241 + 7107556 = 3579^2 + 2666^2 .

It is a cyclic number.

It is not a de Polignac number, because 19916797 - 2⁷ = 19916669 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19916797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19916791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9958398 + 9958399.

It is an arithmetic number, because the mean of its divisors is an integer number (9958399).

Almost surely, 2^19916797 is an apocalyptic number.

It is an amenable number.

19916797 is a deficient number, since it is larger than the sum of its proper divisors (1).

19916797 is an equidigital number, since it uses as much as digits as its factorization.

19916797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 214326, while the sum is 49.

The square root of 19916797 is about 4462.8238818040. The cubic root of 19916797 is about 271.0648256569.

The spelling of 19916797 in words is "nineteen million, nine hundred sixteen thousand, seven hundred ninety-seven".