1809936 has 30 divisors (see below), whose sum is σ = 5065710. Its totient is φ = 603264.

The previous prime is 1809917. The next prime is 1809937. The reversal of 1809936 is 6399081.

It can be written as a sum of positive squares in only one way, i.e., 1806336 + 3600 = 1344^2 + 60^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1809936.

It is not an unprimeable number, because it can be changed into a prime (1809937) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6141 + ... + 6428.

It is an arithmetic number, because the mean of its divisors is an integer number (168857).

2^1809936 is an apocalyptic number.

1809936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1809936 is an abundant number, since it is smaller than the sum of its proper divisors (3255774).

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

1809936 is a wasteful number, since it uses less digits than its factorization.

1809936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12583 (or 12574 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1809936 is about 1345.3386190844. The cubic root of 1809936 is about 121.8674543652.

The spelling of 1809936 in words is "one million, eight hundred nine thousand, nine hundred thirty-six".