19884869 has 2 divisors, whose sum is σ = 19884870. Its totient is φ = 19884868.

The previous prime is 19884847. The next prime is 19884913. The reversal of 19884869 is 96848891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19802500 + 82369 = 4450^2 + 287^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19884869 is a prime.

It is a super-2 number, since 2×19884869² = 790816030294322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19884869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19884269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9942434 + 9942435.

It is an arithmetic number, because the mean of its divisors is an integer number (9942435).

Almost surely, 2^19884869 is an apocalyptic number.

It is an amenable number.

19884869 is a deficient number, since it is larger than the sum of its proper divisors (1).

19884869 is an equidigital number, since it uses as much as digits as its factorization.

19884869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 53.

The square root of 19884869 is about 4459.2453397408. The cubic root of 19884869 is about 270.9199029819.

The spelling of 19884869 in words is "nineteen million, eight hundred eighty-four thousand, eight hundred sixty-nine".