19996969 has 2 divisors, whose sum is σ = 19996970. Its totient is φ = 19996968.

The previous prime is 19996961. The next prime is 19996993. The reversal of 19996969 is 96969991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18275625 + 1721344 = 4275^2 + 1312^2 .

It is an emirp because it is prime and its reverse (96969991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19996969 - 2³ = 19996961 is a prime.

It is a super-2 number, since 2×19996969² = 799757538373922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19996961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9998484 + 9998485.

It is an arithmetic number, because the mean of its divisors is an integer number (9998485).

Almost surely, 2^19996969 is an apocalyptic number.

It is an amenable number.

19996969 is a deficient number, since it is larger than the sum of its proper divisors (1).

19996969 is an equidigital number, since it uses as much as digits as its factorization.

19996969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2125764, while the sum is 58.

The square root of 19996969 is about 4471.7970660574. The cubic root of 19996969 is about 271.4280486337.

The spelling of 19996969 in words is "nineteen million, nine hundred ninety-six thousand, nine hundred sixty-nine".