1081821 has 8 divisors (see below), whose sum is σ = 1553440. Its totient is φ = 665712.

The previous prime is 1081813. The next prime is 1081823. The reversal of 1081821 is 1281801.

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

It is not a de Polignac number, because 1081821 - 2³ = 1081813 is a prime.

It is a Duffinian number.

1081821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081823) 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, 13831 + ... + 13908.

It is an arithmetic number, because the mean of its divisors is an integer number (194180).

2^1081821 is an apocalyptic number.

It is an amenable number.

1081821 is a deficient number, since it is larger than the sum of its proper divisors (471619).

1081821 is a wasteful number, since it uses less digits than its factorization.

1081821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27755.

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 1081821 is about 1040.1062445731. The cubic root of 1081821 is about 102.6561886104.

The spelling of 1081821 in words is "one million, eighty-one thousand, eight hundred twenty-one".