1968009 has 8 divisors (see below), whose sum is σ = 2631552. Its totient is φ = 1308240.

The previous prime is 1967947. The next prime is 1968017. The reversal of 1968009 is 9008691.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1968009 - 2⁸ = 1967753 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1968019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 672 + ... + 2094.

It is an arithmetic number, because the mean of its divisors is an integer number (328944).

2^1968009 is an apocalyptic number.

It is an amenable number.

1968009 is a deficient number, since it is larger than the sum of its proper divisors (663543).

1968009 is a wasteful number, since it uses less digits than its factorization.

1968009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1887.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 1968009 is about 1402.8574410823. The cubic root of 1968009 is about 125.3167221522.

The spelling of 1968009 in words is "one million, nine hundred sixty-eight thousand, nine".