19984669 has 2 divisors, whose sum is σ = 19984670. Its totient is φ = 19984668.

The previous prime is 19984667. The next prime is 19984681. The reversal of 19984669 is 96648991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19404025 + 580644 = 4405^2 + 762^2 .

It is a cyclic number.

It is not a de Polignac number, because 19984669 - 2¹ = 19984667 is a prime.

It is a super-2 number, since 2×19984669² = 798773990079122, which contains 22 as substring.

Together with 19984667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19984663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9992334 + 9992335.

It is an arithmetic number, because the mean of its divisors is an integer number (9992335).

Almost surely, 2^19984669 is an apocalyptic number.

It is an amenable number.

19984669 is a deficient number, since it is larger than the sum of its proper divisors (1).

19984669 is an equidigital number, since it uses as much as digits as its factorization.

19984669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 52.

The square root of 19984669 is about 4470.4215684877. The cubic root of 19984669 is about 271.3723860357.

The spelling of 19984669 in words is "nineteen million, nine hundred eighty-four thousand, six hundred sixty-nine".