7944421 has 4 divisors (see below), whose sum is σ = 7958412. Its totient is φ = 7930432.

The previous prime is 7944373. The next prime is 7944437. The reversal of 7944421 is 1244497.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1244497 = 367 ⋅3391.

It can be written as a sum of positive squares in 2 ways, for example, as 2117025 + 5827396 = 1455^2 + 2414^2 .

It is a cyclic number.

It is not a de Polignac number, because 7944421 - 2¹¹ = 7942373 is a prime.

It is a super-2 number, since 2×7944421² = 126227650050482, 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 (7944481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6106 + ... + 7291.

It is an arithmetic number, because the mean of its divisors is an integer number (1989603).

Almost surely, 2^7944421 is an apocalyptic number.

It is an amenable number.

7944421 is a deficient number, since it is larger than the sum of its proper divisors (13991).

7944421 is a wasteful number, since it uses less digits than its factorization.

7944421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13990.

The product of its digits is 8064, while the sum is 31.

The square root of 7944421 is about 2818.5849286477. The cubic root of 7944421 is about 199.5357649294.

The spelling of 7944421 in words is "seven million, nine hundred forty-four thousand, four hundred twenty-one".