19925849 has 2 divisors, whose sum is σ = 19925850. Its totient is φ = 19925848.

The previous prime is 19925831. The next prime is 19925879. The reversal of 19925849 is 94852991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12673600 + 7252249 = 3560^2 + 2693^2 .

It is a cyclic number.

It is not a de Polignac number, because 19925849 - 2⁸ = 19925593 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19925879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9962924 + 9962925.

It is an arithmetic number, because the mean of its divisors is an integer number (9962925).

Almost surely, 2^19925849 is an apocalyptic number.

It is an amenable number.

19925849 is a deficient number, since it is larger than the sum of its proper divisors (1).

19925849 is an equidigital number, since it uses as much as digits as its factorization.

19925849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 47.

The square root of 19925849 is about 4463.8379226849. The cubic root of 19925849 is about 271.1058849224.

The spelling of 19925849 in words is "nineteen million, nine hundred twenty-five thousand, eight hundred forty-nine".