19380971 has 2 divisors, whose sum is σ = 19380972. Its totient is φ = 19380970.

The previous prime is 19380953. The next prime is 19381009. The reversal of 19380971 is 17908391.

It is an a-pointer prime, because the next prime (19381009) can be obtained adding 19380971 to its sum of digits (38).

It is a weak prime.

It is an emirp because it is prime and its reverse (17908391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19380971 - 2²² = 15186667 is a prime.

It is not a weakly prime, because it can be changed into another prime (19380871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9690485 + 9690486.

It is an arithmetic number, because the mean of its divisors is an integer number (9690486).

Almost surely, 2^19380971 is an apocalyptic number.

19380971 is a deficient number, since it is larger than the sum of its proper divisors (1).

19380971 is an equidigital number, since it uses as much as digits as its factorization.

19380971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 19380971 is about 4402.3824231886. The cubic root of 19380971 is about 268.6118557377.

The spelling of 19380971 in words is "nineteen million, three hundred eighty thousand, nine hundred seventy-one".