1123813 has 4 divisors (see below), whose sum is σ = 1126188. Its totient is φ = 1121440.

The previous prime is 1123807. The next prime is 1123841. The reversal of 1123813 is 3183211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 543169 + 580644 = 737^2 + 762^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208 + ... + 1513.

It is an arithmetic number, because the mean of its divisors is an integer number (281547).

2^1123813 is an apocalyptic number.

It is an amenable number.

1123813 is a deficient number, since it is larger than the sum of its proper divisors (2375).

1123813 is an equidigital number, since it uses as much as digits as its factorization.

1123813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374.

The product of its digits is 144, while the sum is 19.

The square root of 1123813 is about 1060.1004669370. The cubic root of 1123813 is about 103.9675996210.

It can be divided in two parts, 1123 and 813, that added together give a square (1936 = 44²).

The spelling of 1123813 in words is "one million, one hundred twenty-three thousand, eight hundred thirteen".