19397927 has 2 divisors, whose sum is σ = 19397928. Its totient is φ = 19397926.

The previous prime is 19397921. The next prime is 19397929. The reversal of 19397927 is 72979391.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19397927 - 2²² = 15203623 is a prime.

Together with 19397929, 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 (19397921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9698963 + 9698964.

It is an arithmetic number, because the mean of its divisors is an integer number (9698964).

Almost surely, 2^19397927 is an apocalyptic number.

19397927 is a deficient number, since it is larger than the sum of its proper divisors (1).

19397927 is an equidigital number, since it uses as much as digits as its factorization.

19397927 is an evil number, because the sum of its binary digits is even.

The product of its digits is 214326, while the sum is 47.

The square root of 19397927 is about 4404.3077776195. The cubic root of 19397927 is about 268.6901671741.

The spelling of 19397927 in words is "nineteen million, three hundred ninety-seven thousand, nine hundred twenty-seven".