19999969 has 12 divisors (see below), whose sum is σ = 22320592. Its totient is φ = 17903160.

The previous prime is 19999963. The next prime is 19999981. The reversal of 19999969 is 96999991.

It is not a de Polignac number, because 19999969 - 2¹⁷ = 19868897 is a prime.

It is a super-2 number, since 2×19999969² = 799997520001922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19999963) 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 11 ways as a sum of consecutive naturals, for example, 6874 + ... + 9340.

Almost surely, 2^19999969 is an apocalyptic number.

It is an amenable number.

19999969 is a deficient number, since it is larger than the sum of its proper divisors (2320623).

19999969 is a wasteful number, since it uses less digits than its factorization.

19999969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556 (or 2545 counting only the distinct ones).

The product of its digits is 3188646, while the sum is 61.

The square root of 19999969 is about 4472.1324890929. The cubic root of 19999969 is about 271.4416214145.

The spelling of 19999969 in words is "nineteen million, nine hundred ninety-nine thousand, nine hundred sixty-nine".