13638042012 has 72 divisors (see below), whose sum is σ = 37055027856. Its totient is φ = 3892637952.

The previous prime is 13638042007. The next prime is 13638042013. The reversal of 13638042012 is 21024083631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13638042013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 596178 + ... + 618630.

Almost surely, 2^13638042012 is an apocalyptic number.

13638042012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13638042012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18527513928).

13638042012 is an abundant number, since it is smaller than the sum of its proper divisors (23416985844).

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

13638042012 is a wasteful number, since it uses less digits than its factorization.

13638042012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23507 (or 23498 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The spelling of 13638042012 in words is "thirteen billion, six hundred thirty-eight million, forty-two thousand, twelve".