19838971 has 2 divisors, whose sum is σ = 19838972. Its totient is φ = 19838970.

The previous prime is 19838963. The next prime is 19838989. The reversal of 19838971 is 17983891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19838971 - 2³ = 19838963 is a prime.

It is not a weakly prime, because it can be changed into another prime (19838921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9919485 + 9919486.

It is an arithmetic number, because the mean of its divisors is an integer number (9919486).

Almost surely, 2^19838971 is an apocalyptic number.

19838971 is a deficient number, since it is larger than the sum of its proper divisors (1).

19838971 is an equidigital number, since it uses as much as digits as its factorization.

19838971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 46.

The square root of 19838971 is about 4454.0959801064. The cubic root of 19838971 is about 270.7112977826.

The spelling of 19838971 in words is "nineteen million, eight hundred thirty-eight thousand, nine hundred seventy-one".