1820043 has 8 divisors (see below), whose sum is σ = 2696400. Its totient is φ = 1213344.

The previous prime is 1820033. The next prime is 1820047. The reversal of 1820043 is 3400281.

It is a happy number.

It is not a de Polignac number, because 1820043 - 2¹³ = 1811851 is a prime.

1820043 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1819998 and 1820025.

It is not an unprimeable number, because it can be changed into a prime (1820047) 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, 33678 + ... + 33731.

It is an arithmetic number, because the mean of its divisors is an integer number (337050).

2^1820043 is an apocalyptic number.

1820043 is a deficient number, since it is larger than the sum of its proper divisors (876357).

1820043 is an equidigital number, since it uses as much as digits as its factorization.

1820043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67418 (or 67412 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1820043 is about 1349.0896930894. The cubic root of 1820043 is about 122.0938765047.

The spelling of 1820043 in words is "one million, eight hundred twenty thousand, forty-three".