19968629 has 2 divisors, whose sum is σ = 19968630. Its totient is φ = 19968628.

The previous prime is 19968589. The next prime is 19968631. The reversal of 19968629 is 92686991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15194404 + 4774225 = 3898^2 + 2185^2 .

It is a cyclic number.

It is not a de Polignac number, because 19968629 - 2¹² = 19964533 is a prime.

It is a super-2 number, since 2×19968629² = 797492288279282, which contains 22 as substring.

Together with 19968631, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19968649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9984314 + 9984315.

It is an arithmetic number, because the mean of its divisors is an integer number (9984315).

Almost surely, 2^19968629 is an apocalyptic number.

It is an amenable number.

19968629 is a deficient number, since it is larger than the sum of its proper divisors (1).

19968629 is an equidigital number, since it uses as much as digits as its factorization.

19968629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 50.

The square root of 19968629 is about 4468.6271941168. The cubic root of 19968629 is about 271.2997640651.

The spelling of 19968629 in words is "nineteen million, nine hundred sixty-eight thousand, six hundred twenty-nine".