19799219 has 4 divisors (see below), whose sum is σ = 21599160. Its totient is φ = 17999280.

The previous prime is 19799191. The next prime is 19799231. The reversal of 19799219 is 91299791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91299791 = 11 ⋅8299981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19799219 is a prime.

It is a super-2 number, since 2×19799219² = 784018146019922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19799239) 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, 899954 + ... + 899975.

It is an arithmetic number, because the mean of its divisors is an integer number (5399790).

Almost surely, 2^19799219 is an apocalyptic number.

19799219 is a deficient number, since it is larger than the sum of its proper divisors (1799941).

19799219 is a wasteful number, since it uses less digits than its factorization.

19799219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799940.

The product of its digits is 91854, while the sum is 47.

The square root of 19799219 is about 4449.6313330432. The cubic root of 19799219 is about 270.5303658327.

The spelling of 19799219 in words is "nineteen million, seven hundred ninety-nine thousand, two hundred nineteen".