19808469 has 40 divisors (see below), whose sum is σ = 31808480. Its totient is φ = 12247200.

The previous prime is 19808449. The next prime is 19808491. The reversal of 19808469 is 96480891.

It is not a de Polignac number, because 19808469 - 2¹² = 19804373 is a prime.

It is a super-2 number, since 2×19808469² = 784750888247922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19808429) 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 in 39 ways as a sum of consecutive naturals, for example, 93774 + ... + 93984.

It is an arithmetic number, because the mean of its divisors is an integer number (795212).

Almost surely, 2^19808469 is an apocalyptic number.

19808469 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19808469 is a deficient number, since it is larger than the sum of its proper divisors (12000011).

19808469 is a wasteful number, since it uses less digits than its factorization.

19808469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 19808469 is about 4450.6706236252. The cubic root of 19808469 is about 270.5724889805.

The spelling of 19808469 in words is "nineteen million, eight hundred eight thousand, four hundred sixty-nine".