7979621 has 4 divisors (see below), whose sum is σ = 8593452. Its totient is φ = 7365792.

The previous prime is 7979599. The next prime is 7979623. The reversal of 7979621 is 1269797.

It is a happy number.

7979621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 662596 + 7317025 = 814^2 + 2705^2 .

It is a cyclic number.

It is not a de Polignac number, because 7979621 - 2¹⁴ = 7963237 is a prime.

It is a super-3 number, since 3×7979621³ (a number of 22 digits) contains 333 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7979623) 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, 306896 + ... + 306921.

It is an arithmetic number, because the mean of its divisors is an integer number (2148363).

Almost surely, 2^7979621 is an apocalyptic number.

It is an amenable number.

7979621 is a deficient number, since it is larger than the sum of its proper divisors (613831).

7979621 is a wasteful number, since it uses less digits than its factorization.

7979621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613830.

The product of its digits is 47628, while the sum is 41.

The square root of 7979621 is about 2824.8222952958. The cubic root of 7979621 is about 199.8300305929.

The spelling of 7979621 in words is "seven million, nine hundred seventy-nine thousand, six hundred twenty-one".