8821641 has 8 divisors (see below), whose sum is σ = 11876800. Its totient is φ = 5823792.

The previous prime is 8821633. The next prime is 8821661. The reversal of 8821641 is 1461288.

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

It is not a de Polignac number, because 8821641 - 2³ = 8821633 is a prime.

It is a Duffinian number.

8821641 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 8821599 and 8821608.

It is not an unprimeable number, because it can be changed into a prime (8821661) 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, 13966 + ... + 14583.

It is an arithmetic number, because the mean of its divisors is an integer number (1484600).

Almost surely, 2^8821641 is an apocalyptic number.

It is an amenable number.

8821641 is a deficient number, since it is larger than the sum of its proper divisors (3055159).

8821641 is a wasteful number, since it uses less digits than its factorization.

8821641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28655.

The product of its digits is 3072, while the sum is 30.

The square root of 8821641 is about 2970.1247448550. The cubic root of 8821641 is about 206.6251237460.

The spelling of 8821641 in words is "eight million, eight hundred twenty-one thousand, six hundred forty-one".