7944389 has 4 divisors (see below), whose sum is σ = 8411724. Its totient is φ = 7477056.

The previous prime is 7944373. The next prime is 7944437. The reversal of 7944389 is 9834497.

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 5841889 + 2102500 = 2417^2 + 1450^2 .

It is a cyclic number.

It is not a de Polignac number, because 7944389 - 2⁴ = 7944373 is a prime.

It is a super-2 number, since 2×7944389² = 126226633166642, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7944089) 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, 233642 + ... + 233675.

It is an arithmetic number, because the mean of its divisors is an integer number (2102931).

Almost surely, 2^7944389 is an apocalyptic number.

It is an amenable number.

7944389 is a deficient number, since it is larger than the sum of its proper divisors (467335).

7944389 is a wasteful number, since it uses less digits than its factorization.

7944389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467334.

The product of its digits is 217728, while the sum is 44.

The square root of 7944389 is about 2818.5792520346. The cubic root of 7944389 is about 199.5354970201.

The spelling of 7944389 in words is "seven million, nine hundred forty-four thousand, three hundred eighty-nine".