1804919 has 2 divisors, whose sum is σ = 1804920. Its totient is φ = 1804918.

The previous prime is 1804871. The next prime is 1804921. The reversal of 1804919 is 9194081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1804919 - 2¹² = 1800823 is a prime.

It is a super-2 number, since 2×1804919² = 6515465193122, which contains 22 as substring.

Together with 1804921, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1804939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 902459 + 902460.

It is an arithmetic number, because the mean of its divisors is an integer number (902460).

2^1804919 is an apocalyptic number.

1804919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1804919 is an equidigital number, since it uses as much as digits as its factorization.

1804919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1804919 is about 1343.4727388377. The cubic root of 1804919 is about 121.7547478356.

The spelling of 1804919 in words is "one million, eight hundred four thousand, nine hundred nineteen".