1897871 has 2 divisors, whose sum is σ = 1897872. Its totient is φ = 1897870.

The previous prime is 1897843. The next prime is 1897939. The reversal of 1897871 is 1787981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1897871 - 2⁶ = 1897807 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 (1897801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 948935 + 948936.

It is an arithmetic number, because the mean of its divisors is an integer number (948936).

2^1897871 is an apocalyptic number.

1897871 is a deficient number, since it is larger than the sum of its proper divisors (1).

1897871 is an equidigital number, since it uses as much as digits as its factorization.

1897871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 41.

The square root of 1897871 is about 1377.6323892824. The cubic root of 1897871 is about 123.8099542837.

The spelling of 1897871 in words is "one million, eight hundred ninety-seven thousand, eight hundred seventy-one".