309864349138 has 32 divisors (see below), whose sum is σ = 486689575680. Its totient is φ = 147682106880.

The previous prime is 309864349133. The next prime is 309864349147. The reversal of 309864349138 is 831943468903.

It is a happy number.

It is a super-2 number, since 2×309864349138² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (309864349133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17782206 + ... + 17799622.

It is an arithmetic number, because the mean of its divisors is an integer number (15209049240).

Almost surely, 2^309864349138 is an apocalyptic number.

309864349138 is a deficient number, since it is larger than the sum of its proper divisors (176825226542).

309864349138 is a wasteful number, since it uses less digits than its factorization.

309864349138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18762.

The product of its (nonzero) digits is 13436928, while the sum is 58.

The spelling of 309864349138 in words is "three hundred nine billion, eight hundred sixty-four million, three hundred forty-nine thousand, one hundred thirty-eight".