1296512280 has 384 divisors, whose sum is σ = 5057769600. Its totient is φ = 281788416.

The previous prime is 1296512267. The next prime is 1296512281. The reversal of 1296512280 is 822156921.

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 (1296512281) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8257962 + ... + 8258118.

It is an arithmetic number, because the mean of its divisors is an integer number (13171275).

Almost surely, 2^1296512280 is an apocalyptic number.

1296512280 is a gapful number since it is divisible by the number (10) 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 1296512280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2528884800).

1296512280 is an abundant number, since it is smaller than the sum of its proper divisors (3761257320).

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

1296512280 is a wasteful number, since it uses less digits than its factorization.

1296512280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1296512280 is about 36007.1142970386. The cubic root of 1296512280 is about 1090.4159902537.

The spelling of 1296512280 in words is "one billion, two hundred ninety-six million, five hundred twelve thousand, two hundred eighty".