1000813 has 8 divisors (see below), whose sum is σ = 1121760. Its totient is φ = 884880.

The previous prime is 1000793. The next prime is 1000829. The reversal of 1000813 is 3180001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1000813 is a prime.

It is a super-3 number, since 3×1000813³ = 3007322950333103391, which contains 333 as substring.

It is a Duffinian number.

1000813 is a modest number, since divided by 813 gives 10 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1000793 and 1000802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 823 + ... + 1636.

It is an arithmetic number, because the mean of its divisors is an integer number (140220).

2^1000813 is an apocalyptic number.

It is an amenable number.

1000813 is a deficient number, since it is larger than the sum of its proper divisors (120947).

1000813 is a wasteful number, since it uses less digits than its factorization.

1000813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2507.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1000813 is about 1000.4064174124. The cubic root of 1000813 is about 100.0270926592.

Adding to 1000813 its reverse (3180001), we get a palindrome (4180814).

The spelling of 1000813 in words is "one million, eight hundred thirteen", and thus it is an aban number.