1906889 has 2 divisors, whose sum is σ = 1906890. Its totient is φ = 1906888.

The previous prime is 1906871. The next prime is 1906909. The reversal of 1906889 is 9886091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1428025 + 478864 = 1195^2 + 692^2 .

It is an emirp because it is prime and its reverse (9886091) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1906889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1906829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 953444 + 953445.

It is an arithmetic number, because the mean of its divisors is an integer number (953445).

2^1906889 is an apocalyptic number.

It is an amenable number.

1906889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1906889 is an equidigital number, since it uses as much as digits as its factorization.

1906889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 1906889 is about 1380.9015171257. The cubic root of 1906889 is about 124.0057446177.

The spelling of 1906889 in words is "one million, nine hundred six thousand, eight hundred eighty-nine".