1609812 has 36 divisors (see below), whose sum is σ = 4120116. Its totient is φ = 529920.

The previous prime is 1609807. The next prime is 1609843. The reversal of 1609812 is 2189061.

It can be written as a sum of positive squares in 2 ways, for example, as 617796 + 992016 = 786^2 + 996^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3262 + ... + 3722.

2^1609812 is an apocalyptic number.

1609812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1609812 is an abundant number, since it is smaller than the sum of its proper divisors (2510304).

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

1609812 is a wasteful number, since it uses less digits than its factorization.

1609812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568 (or 563 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1609812 is about 1268.7836695040. The cubic root of 1609812 is about 117.1993096365.

It can be divided in two parts, 16098 and 12, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 1609812 in words is "one million, six hundred nine thousand, eight hundred twelve".