1087821 has 24 divisors (see below), whose sum is σ = 1857024. Its totient is φ = 600480.

The previous prime is 1087817. The next prime is 1087829. The reversal of 1087821 is 1287801.

It is not a de Polignac number, because 1087821 - 2² = 1087817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1087829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1675 + ... + 2231.

It is an arithmetic number, because the mean of its divisors is an integer number (77376).

2^1087821 is an apocalyptic number.

It is an amenable number.

1087821 is a deficient number, since it is larger than the sum of its proper divisors (769203).

1087821 is a wasteful number, since it uses less digits than its factorization.

1087821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601 (or 598 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 1087821 is about 1042.9865770948. The cubic root of 1087821 is about 102.8456228831.

The spelling of 1087821 in words is "one million, eighty-seven thousand, eight hundred twenty-one".