9138786309 has 32 divisors (see below), whose sum is σ = 13773562880. Its totient is φ = 5987131200.

The previous prime is 9138786301. The next prime is 9138786311. The reversal of 9138786309 is 9036878319.

It is not a de Polignac number, because 9138786309 - 2³ = 9138786301 is a prime.

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 (9138786301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2579079 + ... + 2582619.

It is an arithmetic number, because the mean of its divisors is an integer number (430423840).

Almost surely, 2^9138786309 is an apocalyptic number.

It is an amenable number.

9138786309 is a deficient number, since it is larger than the sum of its proper divisors (4634776571).

9138786309 is a wasteful number, since it uses less digits than its factorization.

9138786309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5178 (or 5172 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The square root of 9138786309 is about 95596.9994769710. Note that the first 3 decimals coincide. The cubic root of 9138786309 is about 2090.7214460282.

The spelling of 9138786309 in words is "nine billion, one hundred thirty-eight million, seven hundred eighty-six thousand, three hundred nine".