1831813 has 4 divisors (see below), whose sum is σ = 1837440. Its totient is φ = 1826188.

The previous prime is 1831811. The next prime is 1831831. The reversal of 1831813 is 3181381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3181381 = 7 ⋅454483.

It is a cyclic number.

It is not a de Polignac number, because 1831813 - 2¹ = 1831811 is a prime.

It is a Duffinian number.

1831813 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1831811) 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 3 ways as a sum of consecutive naturals, for example, 2293 + ... + 2986.

It is an arithmetic number, because the mean of its divisors is an integer number (459360).

2^1831813 is an apocalyptic number.

It is an amenable number.

1831813 is a deficient number, since it is larger than the sum of its proper divisors (5627).

1831813 is an equidigital number, since it uses as much as digits as its factorization.

1831813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5626.

The product of its digits is 576, while the sum is 25.

The square root of 1831813 is about 1353.4448640414. Note that the first 3 decimals coincide. The cubic root of 1831813 is about 122.3565000207.

It can be divided in two parts, 183181 and 3, that added together give a square (183184 = 428²).

The spelling of 1831813 in words is "one million, eight hundred thirty-one thousand, eight hundred thirteen".