1071809 has 6 divisors (see below), whose sum is σ = 1131570. Its totient is φ = 1015056.

The previous prime is 1071803. The next prime is 1071817. The reversal of 1071809 is 9081701.

It can be written as a sum of positive squares in only one way, i.e., 577600 + 494209 = 760^2 + 703^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1071809 is a prime.

It is a super-2 number, since 2×1071809² = 2297549064962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1071803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1124 + ... + 1845.

It is an arithmetic number, because the mean of its divisors is an integer number (188595).

2^1071809 is an apocalyptic number.

1071809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1071809 is a deficient number, since it is larger than the sum of its proper divisors (59761).

1071809 is an equidigital number, since it uses as much as digits as its factorization.

1071809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3007 (or 2988 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 26.

The square root of 1071809 is about 1035.2820871627. The cubic root of 1071809 is about 102.3385202755.

The spelling of 1071809 in words is "one million, seventy-one thousand, eight hundred nine".