1996509 has 4 divisors (see below), whose sum is σ = 2662016. Its totient is φ = 1331004.

The previous prime is 1996507. The next prime is 1996517. The reversal of 1996509 is 9056991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1996509 - 2¹ = 1996507 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1996507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332749 + ... + 332754.

It is an arithmetic number, because the mean of its divisors is an integer number (665504).

2^1996509 is an apocalyptic number.

It is an amenable number.

1996509 is a deficient number, since it is larger than the sum of its proper divisors (665507).

1996509 is an equidigital number, since it uses as much as digits as its factorization.

1996509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665506.

The product of its (nonzero) digits is 21870, while the sum is 39.

The square root of 1996509 is about 1412.9787684180. The cubic root of 1996509 is about 125.9187558895.

The spelling of 1996509 in words is "one million, nine hundred ninety-six thousand, five hundred nine".