1906909 has 2 divisors, whose sum is σ = 1906910. Its totient is φ = 1906908.

The previous prime is 1906889. The next prime is 1906963. The reversal of 1906909 is 9096091.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1258884 + 648025 = 1122^2 + 805^2 .

It is a cyclic number.

It is not a de Polignac number, because 1906909 - 2¹⁹ = 1382621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1906969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 953454 + 953455.

It is an arithmetic number, because the mean of its divisors is an integer number (953455).

2^1906909 is an apocalyptic number.

It is an amenable number.

1906909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1906909 is an equidigital number, since it uses as much as digits as its factorization.

1906909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 1906909 is about 1380.9087587527. The cubic root of 1906909 is about 124.0061781521.

The spelling of 1906909 in words is "one million, nine hundred six thousand, nine hundred nine".