1799009 has 2 divisors, whose sum is σ = 1799010. Its totient is φ = 1799008.

The previous prime is 1799003. The next prime is 1799011. The reversal of 1799009 is 9009971.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1081600 + 717409 = 1040^2 + 847^2 .

It is a cyclic number.

It is not a de Polignac number, because 1799009 - 2¹² = 1794913 is a prime.

It is a Sophie Germain prime.

Together with 1799011, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1799009.

It is not a weakly prime, because it can be changed into another prime (1799003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 899504 + 899505.

It is an arithmetic number, because the mean of its divisors is an integer number (899505).

2^1799009 is an apocalyptic number.

It is an amenable number.

1799009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1799009 is an equidigital number, since it uses as much as digits as its factorization.

1799009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 1799009 is about 1341.2714117583. The cubic root of 1799009 is about 121.6217118794.

It can be divided in two parts, 179900 and 9, that multiplied together give a triangular number (1619100 = T₁₇₉₉).

The spelling of 1799009 in words is "one million, seven hundred ninety-nine thousand, nine".