12390244638 has 16 divisors (see below), whose sum is σ = 24782184336. Its totient is φ = 4129799040.

The previous prime is 12390244637. The next prime is 12390244753. The reversal of 12390244638 is 83644209321.

It is a self number, because there is not a number n which added to its sum of digits gives 12390244638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12390244637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37020 + ... + 161712.

It is an arithmetic number, because the mean of its divisors is an integer number (1548886521).

Almost surely, 2^12390244638 is an apocalyptic number.

12390244638 is an abundant number, since it is smaller than the sum of its proper divisors (12391939698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12390244638 is a wasteful number, since it uses less digits than its factorization.

12390244638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141259.

The product of its (nonzero) digits is 248832, while the sum is 42.

The spelling of 12390244638 in words is "twelve billion, three hundred ninety million, two hundred forty-four thousand, six hundred thirty-eight".