7944945749 has 4 divisors (see below), whose sum is σ = 8556095436. Its totient is φ = 7333796064.

The previous prime is 7944945727. The next prime is 7944945751. The reversal of 7944945749 is 9475494497.

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 4251952849 + 3692992900 = 65207^2 + 60770^2 .

It is a cyclic number.

It is not a de Polignac number, because 7944945749 - 2⁸ = 7944945493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7944945691 and 7944945700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7944945719) 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, 305574824 + ... + 305574849.

It is an arithmetic number, because the mean of its divisors is an integer number (2139023859).

Almost surely, 2^7944945749 is an apocalyptic number.

It is an amenable number.

7944945749 is a deficient number, since it is larger than the sum of its proper divisors (611149687).

7944945749 is a wasteful number, since it uses less digits than its factorization.

7944945749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611149686.

The product of its digits is 45722880, while the sum is 62.

The square root of 7944945749 is about 89134.4251622234. The cubic root of 7944945749 is about 1995.4015811249.

The spelling of 7944945749 in words is "seven billion, nine hundred forty-four million, nine hundred forty-five thousand, seven hundred forty-nine".