19804849 has 2 divisors, whose sum is σ = 19804850. Its totient is φ = 19804848.

The previous prime is 19804843. The next prime is 19804861. The reversal of 19804849 is 94840891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14876449 + 4928400 = 3857^2 + 2220^2 .

It is a cyclic number.

It is not a de Polignac number, because 19804849 - 2⁷ = 19804721 is a prime.

It is not a weakly prime, because it can be changed into another prime (19804843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9902424 + 9902425.

It is an arithmetic number, because the mean of its divisors is an integer number (9902425).

Almost surely, 2^19804849 is an apocalyptic number.

It is an amenable number.

19804849 is a deficient number, since it is larger than the sum of its proper divisors (1).

19804849 is an equidigital number, since it uses as much as digits as its factorization.

19804849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 19804849 is about 4450.2639247577. The cubic root of 19804849 is about 270.5560055918.

The spelling of 19804849 in words is "nineteen million, eight hundred four thousand, eight hundred forty-nine".