19944797 has 2 divisors, whose sum is σ = 19944798. Its totient is φ = 19944796.

The previous prime is 19944763. The next prime is 19944829. The reversal of 19944797 is 79744991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13498276 + 6446521 = 3674^2 + 2539^2 .

It is an emirp because it is prime and its reverse (79744991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19944797 - 2⁸ = 19944541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19940797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9972398 + 9972399.

It is an arithmetic number, because the mean of its divisors is an integer number (9972399).

Almost surely, 2^19944797 is an apocalyptic number.

It is an amenable number.

19944797 is a deficient number, since it is larger than the sum of its proper divisors (1).

19944797 is an equidigital number, since it uses as much as digits as its factorization.

19944797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 50.

The square root of 19944797 is about 4465.9598072531. The cubic root of 19944797 is about 271.1917915404.

The spelling of 19944797 in words is "nineteen million, nine hundred forty-four thousand, seven hundred ninety-seven".