19427 has 2 divisors, whose sum is σ = 19428. Its totient is φ = 19426.
The previous prime is 19423. The next prime is 19429. The reversal of 19427 is 72491.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 19427 - 22 = 19423 is a prime.
Together with 19429, it forms a pair of twin primes.
It is a Chen prime.
It is an Ulam number.
It is not a weakly prime, because it can be changed into another prime (19421) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9713 + 9714.
It is an arithmetic number, because the mean of its divisors is an integer number (9714).
219427 is an apocalyptic number.
19427 is a deficient number, since it is larger than the sum of its proper divisors (1).
19427 is an equidigital number, since it uses as much as digits as its factorization.
19427 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 504, while the sum is 23.
The square root of 19427 is about 139.3807734230. The cubic root of 19427 is about 26.8824334945.
The spelling of 19427 in words is "nineteen thousand, four hundred twenty-seven".
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