1088821 has 4 divisors (see below), whose sum is σ = 1091200. Its totient is φ = 1086444.

The previous prime is 1088807. The next prime is 1088827. The reversal of 1088821 is 1288801.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1288801 = 53 ⋅24317.

It is a cyclic number.

It is not a de Polignac number, because 1088821 - 2⁷ = 1088693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1088821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1088827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261 + ... + 1498.

It is an arithmetic number, because the mean of its divisors is an integer number (272800).

2^1088821 is an apocalyptic number.

It is an amenable number.

1088821 is a deficient number, since it is larger than the sum of its proper divisors (2379).

1088821 is an equidigital number, since it uses as much as digits as its factorization.

1088821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2378.

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 1088821 is about 1043.4658595278. The cubic root of 1088821 is about 102.8771274918.

It can be divided in two parts, 10 and 88821, that added together give a triangular number (88831 = T₄₂₁).

The spelling of 1088821 in words is "one million, eighty-eight thousand, eight hundred twenty-one".