1045821 has 8 divisors (see below), whose sum is σ = 1593664. Its totient is φ = 597600.

The previous prime is 1045819. The next prime is 1045829. The reversal of 1045821 is 1285401.

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

It is not a de Polignac number, because 1045821 - 2¹ = 1045819 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 49801 = 1045821 / (1 + 0 + 4 + 5 + 8 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1045829) 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, 24880 + ... + 24921.

It is an arithmetic number, because the mean of its divisors is an integer number (199208).

2^1045821 is an apocalyptic number.

It is an amenable number.

1045821 is a deficient number, since it is larger than the sum of its proper divisors (547843).

1045821 is an equidigital number, since it uses as much as digits as its factorization.

1045821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49811.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 1045821 is about 1022.6539003984. The cubic root of 1045821 is about 101.5046144779.

The spelling of 1045821 in words is "one million, forty-five thousand, eight hundred twenty-one".