7944381 has 12 divisors (see below), whose sum is σ = 11785852. Its totient is φ = 5152896.

The previous prime is 7944373. The next prime is 7944437. The reversal of 7944381 is 1834497.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3572100 + 4372281 = 1890^2 + 2091^2 .

It is not a de Polignac number, because 7944381 - 2³ = 7944373 is a prime.

It is a super-2 number, since 2×7944381² = 126226378946322, 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 (7944301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11596 + ... + 12261.

Almost surely, 2^7944381 is an apocalyptic number.

It is an amenable number.

7944381 is a deficient number, since it is larger than the sum of its proper divisors (3841471).

7944381 is a wasteful number, since it uses less digits than its factorization.

7944381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23900 (or 23897 counting only the distinct ones).

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

The square root of 7944381 is about 2818.5778328796. The cubic root of 7944381 is about 199.5354300427.

It can be divided in two parts, 79443 and 81, that added together give a square (79524 = 282²).

The spelling of 7944381 in words is "seven million, nine hundred forty-four thousand, three hundred eighty-one".