1820473 has 4 divisors (see below), whose sum is σ = 1899648. Its totient is φ = 1741300.

The previous prime is 1820471. The next prime is 1820501. The reversal of 1820473 is 3740281.

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.

It is a cyclic number.

It is not a de Polignac number, because 1820473 - 2¹ = 1820471 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1820471) 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, 39553 + ... + 39598.

It is an arithmetic number, because the mean of its divisors is an integer number (474912).

2^1820473 is an apocalyptic number.

It is an amenable number.

1820473 is a deficient number, since it is larger than the sum of its proper divisors (79175).

1820473 is an equidigital number, since it uses as much as digits as its factorization.

1820473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79174.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 1820473 is about 1349.2490503980. The cubic root of 1820473 is about 122.1034909722.

The spelling of 1820473 in words is "one million, eight hundred twenty thousand, four hundred seventy-three".