7443981 has 20 divisors (see below), whose sum is σ = 11507100. Its totient is φ = 4790016.

The previous prime is 7443979. The next prime is 7444027. The reversal of 7443981 is 1893447.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5103081 + 2340900 = 2259^2 + 1530^2 .

It is not a de Polignac number, because 7443981 - 2¹ = 7443979 is a prime.

It is a super-2 number, since 2×7443981² = 110825706256722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7443911) 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 19 ways as a sum of consecutive naturals, for example, 765 + ... + 3933.

It is an arithmetic number, because the mean of its divisors is an integer number (575355).

Almost surely, 2^7443981 is an apocalyptic number.

It is an amenable number.

7443981 is a deficient number, since it is larger than the sum of its proper divisors (4063119).

7443981 is a wasteful number, since it uses less digits than its factorization.

7443981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3210 (or 3201 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 7443981 is about 2728.3659945103. The cubic root of 7443981 is about 195.2548148066.

The spelling of 7443981 in words is "seven million, four hundred forty-three thousand, nine hundred eighty-one".