1909959 has 4 divisors (see below), whose sum is σ = 2546616. Its totient is φ = 1273304.

The previous prime is 1909951. The next prime is 1909981. The reversal of 1909959 is 9599091.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1909959 - 2³ = 1909951 is a prime.

It is a D-number.

1909959 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1909959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318324 + ... + 318329.

It is an arithmetic number, because the mean of its divisors is an integer number (636654).

2^1909959 is an apocalyptic number.

1909959 is a deficient number, since it is larger than the sum of its proper divisors (636657).

1909959 is an equidigital number, since it uses as much as digits as its factorization.

1909959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636656.

The product of its (nonzero) digits is 32805, while the sum is 42.

The square root of 1909959 is about 1382.0126627495. The cubic root of 1909959 is about 124.0722567074.

The spelling of 1909959 in words is "one million, nine hundred nine thousand, nine hundred fifty-nine".