19824869 has 2 divisors, whose sum is σ = 19824870. Its totient is φ = 19824868.

The previous prime is 19824823. The next prime is 19824877. The reversal of 19824869 is 96842891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11628100 + 8196769 = 3410^2 + 2863^2 .

It is a cyclic number.

It is not a de Polignac number, because 19824869 - 2²⁰ = 18776293 is a prime.

It is a super-2 number, since 2×19824869² = 786050861734322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19824899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9912434 + 9912435.

It is an arithmetic number, because the mean of its divisors is an integer number (9912435).

Almost surely, 2^19824869 is an apocalyptic number.

It is an amenable number.

19824869 is a deficient number, since it is larger than the sum of its proper divisors (1).

19824869 is an equidigital number, since it uses as much as digits as its factorization.

19824869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 47.

The square root of 19824869 is about 4452.5126614082. The cubic root of 19824869 is about 270.6471399588.

The spelling of 19824869 in words is "nineteen million, eight hundred twenty-four thousand, eight hundred sixty-nine".