19938371 has 2 divisors, whose sum is σ = 19938372. Its totient is φ = 19938370.

The previous prime is 19938367. The next prime is 19938377. The reversal of 19938371 is 17383991.

It is a weak prime.

It is an emirp because it is prime and its reverse (17383991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19938371 - 2² = 19938367 is a prime.

It is not a weakly prime, because it can be changed into another prime (19938377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9969185 + 9969186.

It is an arithmetic number, because the mean of its divisors is an integer number (9969186).

Almost surely, 2^19938371 is an apocalyptic number.

19938371 is a deficient number, since it is larger than the sum of its proper divisors (1).

19938371 is an equidigital number, since it uses as much as digits as its factorization.

19938371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 41.

The square root of 19938371 is about 4465.2403070831. The cubic root of 19938371 is about 271.1626633816.

The spelling of 19938371 in words is "nineteen million, nine hundred thirty-eight thousand, three hundred seventy-one".