1804139 has 2 divisors, whose sum is σ = 1804140. Its totient is φ = 1804138.

The previous prime is 1804133. The next prime is 1804199. The reversal of 1804139 is 9314081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1804139 - 2¹⁶ = 1738603 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1804133) 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, 902069 + 902070.

It is an arithmetic number, because the mean of its divisors is an integer number (902070).

2^1804139 is an apocalyptic number.

1804139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1804139 is an equidigital number, since it uses as much as digits as its factorization.

1804139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1804139 is about 1343.1824150129. The cubic root of 1804139 is about 121.7372064414.

The spelling of 1804139 in words is "one million, eight hundred four thousand, one hundred thirty-nine".