12489639156 has 84 divisors (see below), whose sum is σ = 32837204484. Its totient is φ = 4154716800.

The previous prime is 12489639143. The next prime is 12489639187. The reversal of 12489639156 is 65193698421.

12489639156 = T₄₈ + T₄₉ + ... + T₄₂₁₅.

12489639156 is a `hidden beast` number, since 1 + 2 + 489 + 6 + 3 + 9 + 156 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8220323556 + 4269315600 = 90666^2 + 65340^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1515126 + ... + 1523346.

It is an arithmetic number, because the mean of its divisors is an integer number (390919101).

Almost surely, 2^12489639156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12489639156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16418602242).

12489639156 is an abundant number, since it is smaller than the sum of its proper divisors (20347565328).

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

12489639156 is an equidigital number, since it uses as much as digits as its factorization.

12489639156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8764 (or 8747 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The spelling of 12489639156 in words is "twelve billion, four hundred eighty-nine million, six hundred thirty-nine thousand, one hundred fifty-six".