1896991 has 2 divisors, whose sum is σ = 1896992. Its totient is φ = 1896990.

The previous prime is 1896989. The next prime is 1897001. The reversal of 1896991 is 1996981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1896991 - 2¹ = 1896989 is a prime.

It is a super-3 number, since 3×1896991³ = 20479392333053910813, which contains 333 as substring.

Together with 1896989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1896901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 948495 + 948496.

It is an arithmetic number, because the mean of its divisors is an integer number (948496).

2^1896991 is an apocalyptic number.

1896991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1896991 is an equidigital number, since it uses as much as digits as its factorization.

1896991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 43.

The square root of 1896991 is about 1377.3129637087. The cubic root of 1896991 is about 123.7908153637.

The spelling of 1896991 in words is "one million, eight hundred ninety-six thousand, nine hundred ninety-one".