1012809 has 16 divisors (see below), whose sum is σ = 1634688. Its totient is φ = 544512.

The previous prime is 1012789. The next prime is 1012811. The reversal of 1012809 is 9082101.

It is a de Polignac number, because none of the positive numbers 2^k-1012809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

1012809 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1062 + ... + 1775.

It is an arithmetic number, because the mean of its divisors is an integer number (102168).

2^1012809 is an apocalyptic number.

It is an amenable number.

1012809 is a deficient number, since it is larger than the sum of its proper divisors (621879).

1012809 is a wasteful number, since it uses less digits than its factorization.

1012809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2864.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1012809 is about 1006.3841214964. The cubic root of 1012809 is about 100.4251565243.

The spelling of 1012809 in words is "one million, twelve thousand, eight hundred nine".