12912889140 has 36 divisors (see below), whose sum is σ = 39169097604. Its totient is φ = 3443437056.

The previous prime is 12912889133. The next prime is 12912889151. The reversal of 12912889140 is 4198821921.

It can be written as a sum of positive squares in 2 ways, for example, as 5899161636 + 7013727504 = 76806^2 + 83748^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35868957 + ... + 35869316.

It is an arithmetic number, because the mean of its divisors is an integer number (1088030489).

Almost surely, 2^12912889140 is an apocalyptic number.

12912889140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12912889140 is an abundant number, since it is smaller than the sum of its proper divisors (26256208464).

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

12912889140 is a wasteful number, since it uses less digits than its factorization.

12912889140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71738288 (or 71738283 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The spelling of 12912889140 in words is "twelve billion, nine hundred twelve million, eight hundred eighty-nine thousand, one hundred forty".