19958849 has 2 divisors, whose sum is σ = 19958850. Its totient is φ = 19958848.

The previous prime is 19958821. The next prime is 19958863. The reversal of 19958849 is 94885991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15366400 + 4592449 = 3920^2 + 2143^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19958849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19958849.

It is not a weakly prime, because it can be changed into another prime (19958819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9979424 + 9979425.

It is an arithmetic number, because the mean of its divisors is an integer number (9979425).

Almost surely, 2^19958849 is an apocalyptic number.

It is an amenable number.

19958849 is a deficient number, since it is larger than the sum of its proper divisors (1).

19958849 is an equidigital number, since it uses as much as digits as its factorization.

19958849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 53.

The square root of 19958849 is about 4467.5327642895. The cubic root of 19958849 is about 271.2554654976.

The spelling of 19958849 in words is "nineteen million, nine hundred fifty-eight thousand, eight hundred forty-nine".