1023813 has 16 divisors (see below), whose sum is σ = 1733760. Its totient is φ = 584928.

The previous prime is 1023769. The next prime is 1023821. The reversal of 1023813 is 3183201.

It is not a de Polignac number, because 1023813 - 2⁸ = 1023557 is a prime.

It is a Curzon number.

1023813 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023833) 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 in 15 ways as a sum of consecutive naturals, for example, 2520 + ... + 2897.

It is an arithmetic number, because the mean of its divisors is an integer number (108360).

2^1023813 is an apocalyptic number.

It is an amenable number.

1023813 is a deficient number, since it is larger than the sum of its proper divisors (709947).

1023813 is an equidigital number, since it uses as much as digits as its factorization.

1023813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5433 (or 5427 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1023813 is about 1011.8364492348. The cubic root of 1023813 is about 100.7875480650.

The spelling of 1023813 in words is "one million, twenty-three thousand, eight hundred thirteen".