19850797 has 2 divisors, whose sum is σ = 19850798. Its totient is φ = 19850796.

The previous prime is 19850783. The next prime is 19850807. The reversal of 19850797 is 79705891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13147876 + 6702921 = 3626^2 + 2589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19850797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19850717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9925398 + 9925399.

It is an arithmetic number, because the mean of its divisors is an integer number (9925399).

Almost surely, 2^19850797 is an apocalyptic number.

It is an amenable number.

19850797 is a deficient number, since it is larger than the sum of its proper divisors (1).

19850797 is an equidigital number, since it uses as much as digits as its factorization.

19850797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 46.

The square root of 19850797 is about 4455.4233244440. The cubic root of 19850797 is about 270.7650773846.

The spelling of 19850797 in words is "nineteen million, eight hundred fifty thousand, seven hundred ninety-seven".