1804993 has 2 divisors, whose sum is σ = 1804994. Its totient is φ = 1804992.

The previous prime is 1804991. The next prime is 1804997. The reversal of 1804993 is 3994081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1787569 + 17424 = 1337^2 + 132^2 .

It is a cyclic number.

It is not a de Polignac number, because 1804993 - 2¹ = 1804991 is a prime.

Together with 1804991, it forms a pair of twin primes.

It is the 1344-th Hogben number.

It is not a weakly prime, because it can be changed into another prime (1804991) by changing a digit.

It is a nontrivial repunit in base 1343.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 902496 + 902497.

It is an arithmetic number, because the mean of its divisors is an integer number (902497).

2^1804993 is an apocalyptic number.

It is an amenable number.

1804993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1804993 is an equidigital number, since it uses as much as digits as its factorization.

1804993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 1804993 is about 1343.5002791217. The cubic root of 1804993 is about 121.7564117567.

The spelling of 1804993 in words is "one million, eight hundred four thousand, nine hundred ninety-three".