19974169 has 2 divisors, whose sum is σ = 19974170.
Its totient is φ = 19974168.
The previous prime is 19974139. The next prime is 19974197. The reversal of 19974169 is 96147991.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 17977600 + 1996569 = 4240^2 + 1413^2
It is an emirp because it is prime and its reverse (96147991) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 19974169 - 221 = 17877017 is a prime.
It is a super-2 number, since 2×199741692 = 797934854481122, which contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (19974139) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9987084 + 9987085.
It is an arithmetic number, because the mean of its divisors is an integer number (9987085).
Almost surely, 219974169 is an apocalyptic number.
It is an amenable number.
19974169 is a deficient number, since it is larger than the sum of its proper divisors (1).
19974169 is an equidigital number, since it uses as much as digits as its factorization.
19974169 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 122472, while the sum is 46.
The square root of 19974169 is about 4469.2470283035.
The cubic root of 19974169 is about 271.3248511107.
The spelling of 19974169 in words is "nineteen million, nine hundred seventy-four thousand, one hundred sixty-nine".