19706849 has 4 divisors (see below), whose sum is σ = 19779840. Its totient is φ = 19633860.

The previous prime is 19706839. The next prime is 19706867. The reversal of 19706849 is 94860791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19706849 - 2⁴ = 19706833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19706809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36089 + ... + 36630.

It is an arithmetic number, because the mean of its divisors is an integer number (4944960).

Almost surely, 2^19706849 is an apocalyptic number.

It is an amenable number.

19706849 is a deficient number, since it is larger than the sum of its proper divisors (72991).

19706849 is an equidigital number, since it uses as much as digits as its factorization.

19706849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72990.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 19706849 is about 4439.2396871536. The cubic root of 19706849 is about 270.1090049119.

The spelling of 19706849 in words is "nineteen million, seven hundred six thousand, eight hundred forty-nine".