19998469 has 4 divisors (see below), whose sum is σ = 21051040. Its totient is φ = 18945900.

The previous prime is 19998427. The next prime is 19998479. The reversal of 19998469 is 96489991.

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 19998469 - 2¹¹ = 19996421 is a prime.

It is a super-2 number, since 2×19998469² = 799877524687922, 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 (19998479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526257 + ... + 526294.

It is an arithmetic number, because the mean of its divisors is an integer number (5262760).

Almost surely, 2^19998469 is an apocalyptic number.

19998469 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19998469 is a deficient number, since it is larger than the sum of its proper divisors (1052571).

19998469 is a wasteful number, since it uses less digits than its factorization.

19998469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052570.

The product of its digits is 1259712, while the sum is 55.

The square root of 19998469 is about 4471.9647807200. The cubic root of 19998469 is about 271.4348351938.

The spelling of 19998469 in words is "nineteen million, nine hundred ninety-eight thousand, four hundred sixty-nine".