7973621 has 4 divisors (see below), whose sum is σ = 7995372. Its totient is φ = 7951872.

The previous prime is 7973591. The next prime is 7973627. The reversal of 7973621 is 1263797.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2146225 + 5827396 = 1465^2 + 2414^2 .

It is a cyclic number.

It is not a de Polignac number, because 7973621 - 2¹⁴ = 7957237 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7973627) 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, 10316 + ... + 11061.

It is an arithmetic number, because the mean of its divisors is an integer number (1998843).

Almost surely, 2^7973621 is an apocalyptic number.

It is an amenable number.

7973621 is a deficient number, since it is larger than the sum of its proper divisors (21751).

7973621 is a wasteful number, since it uses less digits than its factorization.

7973621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21750.

The product of its digits is 15876, while the sum is 35.

The square root of 7973621 is about 2823.7600818766. The cubic root of 7973621 is about 199.7799329413.

The spelling of 7973621 in words is "seven million, nine hundred seventy-three thousand, six hundred twenty-one".