1821473 has 8 divisors (see below), whose sum is σ = 1969920. Its totient is φ = 1678320.

The previous prime is 1821433. The next prime is 1821481. The reversal of 1821473 is 3741281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1821473 - 2⁶ = 1821409 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1821433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 593 + ... + 1998.

It is an arithmetic number, because the mean of its divisors is an integer number (246240).

2^1821473 is an apocalyptic number.

It is an amenable number.

1821473 is a deficient number, since it is larger than the sum of its proper divisors (148447).

1821473 is a wasteful number, since it uses less digits than its factorization.

1821473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2647.

The product of its digits is 1344, while the sum is 26.

The square root of 1821473 is about 1349.6195760287. The cubic root of 1821473 is about 122.1258443460.

The spelling of 1821473 in words is "one million, eight hundred twenty-one thousand, four hundred seventy-three".