12987123438 has 16 divisors (see below), whose sum is σ = 25978896720. Its totient is φ = 4328266176.

The previous prime is 12987123437. The next prime is 12987123509. The reversal of 12987123438 is 83432178921.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12987123433) 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, 156895 + ... + 224922.

It is an arithmetic number, because the mean of its divisors is an integer number (1623681045).

Almost surely, 2^12987123438 is an apocalyptic number.

12987123438 is an abundant number, since it is smaller than the sum of its proper divisors (12991773282).

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

12987123438 is a wasteful number, since it uses less digits than its factorization.

12987123438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387491.

The product of its digits is 580608, while the sum is 48.

The spelling of 12987123438 in words is "twelve billion, nine hundred eighty-seven million, one hundred twenty-three thousand, four hundred thirty-eight".