7989821 has 8 divisors (see below), whose sum is σ = 9201984. Its totient is φ = 6795360.

The previous prime is 7989769. The next prime is 7989851. The reversal of 7989821 is 1289897.

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

It is a cyclic number.

It is not a de Polignac number, because 7989821 - 2⁶ = 7989757 is a prime.

It is a super-2 number, since 2×7989821² = 127674479224082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7989851) 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, 3440 + ... + 5273.

It is an arithmetic number, because the mean of its divisors is an integer number (1150248).

Almost surely, 2^7989821 is an apocalyptic number.

It is an amenable number.

7989821 is a deficient number, since it is larger than the sum of its proper divisors (1212163).

7989821 is a wasteful number, since it uses less digits than its factorization.

7989821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8851.

The product of its digits is 72576, while the sum is 44.

The square root of 7989821 is about 2826.6271420193. The cubic root of 7989821 is about 199.9151389981.

The spelling of 7989821 in words is "seven million, nine hundred eighty-nine thousand, eight hundred twenty-one".