1809996 has 12 divisors (see below), whose sum is σ = 4223352. Its totient is φ = 603328.

The previous prime is 1809991. The next prime is 1810001. The reversal of 1809996 is 6999081.

It is an interprime number because it is at equal distance from previous prime (1809991) and next prime (1810001).

It is a tau number, because it is divible by the number of its divisors (12).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1809991) 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, 75405 + ... + 75428.

It is an arithmetic number, because the mean of its divisors is an integer number (351946).

2^1809996 is an apocalyptic number.

It is an amenable number.

1809996 is an abundant number, since it is smaller than the sum of its proper divisors (2413356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1809996 is a wasteful number, since it uses less digits than its factorization.

1809996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150840 (or 150838 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 1809996 is about 1345.3609181183. The cubic root of 1809996 is about 121.8688009996.

The spelling of 1809996 in words is "one million, eight hundred nine thousand, nine hundred ninety-six".