7989421 has 8 divisors (see below), whose sum is σ = 8757504. Its totient is φ = 7228320.

The previous prime is 7989419. The next prime is 7989427. The reversal of 7989421 is 1249897.

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

It is not a de Polignac number, because 7989421 - 2¹ = 7989419 is a prime.

It is a Duffinian number.

7989421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7989427) 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, 825 + ... + 4081.

It is an arithmetic number, because the mean of its divisors is an integer number (1094688).

Almost surely, 2^7989421 is an apocalyptic number.

It is an amenable number.

7989421 is a deficient number, since it is larger than the sum of its proper divisors (768083).

7989421 is a wasteful number, since it uses less digits than its factorization.

7989421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3491.

The product of its digits is 36288, while the sum is 40.

The square root of 7989421 is about 2826.5563854273. The cubic root of 7989421 is about 199.9118027786.

The spelling of 7989421 in words is "seven million, nine hundred eighty-nine thousand, four hundred twenty-one".