1820343 has 16 divisors (see below), whose sum is σ = 2937600. Its totient is φ = 978816.

The previous prime is 1820341. The next prime is 1820347. The reversal of 1820343 is 3430281.

It is a happy number.

It is not a de Polignac number, because 1820343 - 2¹ = 1820341 is a prime.

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

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2193 + ... + 2906.

It is an arithmetic number, because the mean of its divisors is an integer number (183600).

2^1820343 is an apocalyptic number.

1820343 is a deficient number, since it is larger than the sum of its proper divisors (1117257).

1820343 is a wasteful number, since it uses less digits than its factorization.

1820343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5126.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1820343 is about 1349.2008745921. The cubic root of 1820343 is about 122.1005844324.

The spelling of 1820343 in words is "one million, eight hundred twenty thousand, three hundred forty-three".