1909841 has 2 divisors, whose sum is σ = 1909842. Its totient is φ = 1909840.

The previous prime is 1909837. The next prime is 1909907. The reversal of 1909841 is 1489091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1638400 + 271441 = 1280^2 + 521^2 .

It is a cyclic number.

It is not a de Polignac number, because 1909841 - 2² = 1909837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1909798 and 1909807.

It is not a weakly prime, because it can be changed into another prime (1909801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954920 + 954921.

It is an arithmetic number, because the mean of its divisors is an integer number (954921).

2^1909841 is an apocalyptic number.

It is an amenable number.

1909841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909841 is an equidigital number, since it uses as much as digits as its factorization.

1909841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1909841 is about 1381.9699707302. The cubic root of 1909841 is about 124.0697015343.

The spelling of 1909841 in words is "one million, nine hundred nine thousand, eight hundred forty-one".