1851804 has 18 divisors (see below), whose sum is σ = 4681040. Its totient is φ = 617256.

The previous prime is 1851803. The next prime is 1851809. The reversal of 1851804 is 4081581.

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1851803) 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, 25684 + ... + 25755.

2^1851804 is an apocalyptic number.

It is an amenable number.

1851804 is an abundant number, since it is smaller than the sum of its proper divisors (2829236).

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

1851804 is a wasteful number, since it uses less digits than its factorization.

1851804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51449 (or 51444 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 1851804 is about 1360.8100528729. The cubic root of 1851804 is about 122.7999922192.

The spelling of 1851804 in words is "one million, eight hundred fifty-one thousand, eight hundred four".