1312156980 has 72 divisors (see below), whose sum is σ = 3985293312. Its totient is φ = 349461696.

The previous prime is 1312156973. The next prime is 1312156981. The reversal of 1312156980 is 896512131.

1312156980 is a `hidden beast` number, since 1 + 3 + 12 + 1 + 569 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312156981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151117 + ... + 159563.

It is an arithmetic number, because the mean of its divisors is an integer number (55351296).

Almost surely, 2^1312156980 is an apocalyptic number.

1312156980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312156980 is an abundant number, since it is smaller than the sum of its proper divisors (2673136332).

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

1312156980 is a wasteful number, since it uses less digits than its factorization.

1312156980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9325 (or 9320 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1312156980 is about 36223.7074303556. The cubic root of 1312156980 is about 1094.7843949056.

The spelling of 1312156980 in words is "one billion, three hundred twelve million, one hundred fifty-six thousand, nine hundred eighty".