19420871 has 2 divisors, whose sum is σ = 19420872. Its totient is φ = 19420870.

The previous prime is 19420867. The next prime is 19420879. The reversal of 19420871 is 17802491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19420871 - 2² = 19420867 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19420879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9710435 + 9710436.

It is an arithmetic number, because the mean of its divisors is an integer number (9710436).

Almost surely, 2^19420871 is an apocalyptic number.

19420871 is a deficient number, since it is larger than the sum of its proper divisors (1).

19420871 is an equidigital number, since it uses as much as digits as its factorization.

19420871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 19420871 is about 4406.9117304525. The cubic root of 19420871 is about 268.7960616200.

The spelling of 19420871 in words is "nineteen million, four hundred twenty thousand, eight hundred seventy-one".