1996409 has 8 divisors (see below), whose sum is σ = 2079360. Its totient is φ = 1915056.

The previous prime is 1996403. The next prime is 1996411. The reversal of 1996409 is 9046991.

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

It is a cyclic number.

It is not a de Polignac number, because 1996409 - 2²⁰ = 947833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1996403) 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, 2582 + ... + 3264.

It is an arithmetic number, because the mean of its divisors is an integer number (259920).

2^1996409 is an apocalyptic number.

It is an amenable number.

1996409 is a deficient number, since it is larger than the sum of its proper divisors (82951).

1996409 is an equidigital number, since it uses as much as digits as its factorization.

1996409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 1996409 is about 1412.9433817390. The cubic root of 1996409 is about 125.9166535389.

The spelling of 1996409 in words is "one million, nine hundred ninety-six thousand, four hundred nine".