1804997 has 2 divisors, whose sum is σ = 1804998. Its totient is φ = 1804996.

The previous prime is 1804993. The next prime is 1805003. The reversal of 1804997 is 7994081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1240996 + 564001 = 1114^2 + 751^2 .

It is an emirp because it is prime and its reverse (7994081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1804997 - 2² = 1804993 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1804997.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 902498 + 902499.

It is an arithmetic number, because the mean of its divisors is an integer number (902499).

2^1804997 is an apocalyptic number.

It is an amenable number.

1804997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1804997 is an equidigital number, since it uses as much as digits as its factorization.

1804997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 1804997 is about 1343.5017677696. The cubic root of 1804997 is about 121.7565016970.

The spelling of 1804997 in words is "one million, eight hundred four thousand, nine hundred ninety-seven".