1949909 has 4 divisors (see below), whose sum is σ = 2099916. Its totient is φ = 1799904.

The previous prime is 1949887. The next prime is 1949911. The reversal of 1949909 is 9099491.

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

It can be written as a sum of positive squares in 2 ways, for example, as 485809 + 1464100 = 697^2 + 1210^2 .

It is a cyclic number.

It is not a de Polignac number, because 1949909 - 2²⁰ = 901333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1949929) 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, 74984 + ... + 75009.

It is an arithmetic number, because the mean of its divisors is an integer number (524979).

2^1949909 is an apocalyptic number.

It is an amenable number.

1949909 is a deficient number, since it is larger than the sum of its proper divisors (150007).

1949909 is a wasteful number, since it uses less digits than its factorization.

1949909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150006.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 1949909 is about 1396.3914207700. The cubic root of 1949909 is about 124.9313543091.

The spelling of 1949909 in words is "one million, nine hundred forty-nine thousand, nine hundred nine".