19940797 has 2 divisors, whose sum is σ = 19940798. Its totient is φ = 19940796.

The previous prime is 19940783. The next prime is 19940807. The reversal of 19940797 is 79704991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17884441 + 2056356 = 4229^2 + 1434^2 .

It is an emirp because it is prime and its reverse (79704991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19940797 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 (19940497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9970398 + 9970399.

It is an arithmetic number, because the mean of its divisors is an integer number (9970399).

Almost surely, 2^19940797 is an apocalyptic number.

It is an amenable number.

19940797 is a deficient number, since it is larger than the sum of its proper divisors (1).

19940797 is an equidigital number, since it uses as much as digits as its factorization.

19940797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884, while the sum is 46.

The square root of 19940797 is about 4465.5119527329. The cubic root of 19940797 is about 271.1736608354.

The spelling of 19940797 in words is "nineteen million, nine hundred forty thousand, seven hundred ninety-seven".