7983621 has 6 divisors (see below), whose sum is σ = 11531910. Its totient is φ = 5322408.

The previous prime is 7983617. The next prime is 7983631. The reversal of 7983621 is 1263897.

It can be written as a sum of positive squares in only one way, i.e., 7918596 + 65025 = 2814^2 + 255^2 .

It is not a de Polignac number, because 7983621 - 2² = 7983617 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7983611) 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 5 ways as a sum of consecutive naturals, for example, 443526 + ... + 443543.

It is an arithmetic number, because the mean of its divisors is an integer number (1921985).

Almost surely, 2^7983621 is an apocalyptic number.

It is an amenable number.

7983621 is a deficient number, since it is larger than the sum of its proper divisors (3548289).

7983621 is a wasteful number, since it uses less digits than its factorization.

7983621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887075 (or 887072 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 7983621 is about 2825.5302157294. The cubic root of 7983621 is about 199.8634150774.

The spelling of 7983621 in words is "seven million, nine hundred eighty-three thousand, six hundred twenty-one".