9856407749 has 8 divisors (see below), whose sum is σ = 10134353880. Its totient is φ = 9580249600.

The previous prime is 9856407733. The next prime is 9856407751. The reversal of 9856407749 is 9477046589.

It can be written as a sum of positive squares in 4 ways, for example, as 145684900 + 9710722849 = 12070^2 + 98543^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9856407749 - 2⁴ = 9856407733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9856407709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 435812 + ... + 457869.

It is an arithmetic number, because the mean of its divisors is an integer number (1266794235).

Almost surely, 2^9856407749 is an apocalyptic number.

It is an amenable number.

9856407749 is a deficient number, since it is larger than the sum of its proper divisors (277946131).

9856407749 is a wasteful number, since it uses less digits than its factorization.

9856407749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893991.

The product of its (nonzero) digits is 15240960, while the sum is 59.

The square root of 9856407749 is about 99279.4427311113. The cubic root of 9856407749 is about 2144.0729307918.

The spelling of 9856407749 in words is "nine billion, eight hundred fifty-six million, four hundred seven thousand, seven hundred forty-nine".