1804121 has 4 divisors (see below), whose sum is σ = 1968144. Its totient is φ = 1640100.

The previous prime is 1804093. The next prime is 1804129. The reversal of 1804121 is 1214081.

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 1804121 - 2¹⁰ = 1803097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1804121.

It is not an unprimeable number, because it can be changed into a prime (1804129) 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, 81995 + ... + 82016.

It is an arithmetic number, because the mean of its divisors is an integer number (492036).

2^1804121 is an apocalyptic number.

1804121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1804121 is a deficient number, since it is larger than the sum of its proper divisors (164023).

1804121 is a wasteful number, since it uses less digits than its factorization.

1804121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164022.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 1804121 is about 1343.1757144916. The cubic root of 1804121 is about 121.7368015803.

The spelling of 1804121 in words is "one million, eight hundred four thousand, one hundred twenty-one".