1804819 has 2 divisors, whose sum is σ = 1804820. Its totient is φ = 1804818.

The previous prime is 1804813. The next prime is 1804841. The reversal of 1804819 is 9184081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1804819 - 2⁹ = 1804307 is a prime.

It is a super-2 number, since 2×1804819² = 6514743245522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1804813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 902409 + 902410.

It is an arithmetic number, because the mean of its divisors is an integer number (902410).

2^1804819 is an apocalyptic number.

1804819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1804819 is an equidigital number, since it uses as much as digits as its factorization.

1804819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 1804819 is about 1343.4355213407. The cubic root of 1804819 is about 121.7524992214.

The spelling of 1804819 in words is "one million, eight hundred four thousand, eight hundred nineteen".