1297640160 has 288 divisors, whose sum is σ = 4689135360. Its totient is φ = 326246400.

The previous prime is 1297640147. The next prime is 1297640161. The reversal of 1297640160 is 610467921.

1297640160 is a `hidden beast` number, since 1 + 2 + 9 + 7 + 640 + 1 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

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 (1297640161) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1829886 + ... + 1830594.

It is an arithmetic number, because the mean of its divisors is an integer number (16281720).

Almost surely, 2^1297640160 is an apocalyptic number.

1297640160 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 1297640160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2344567680).

1297640160 is an abundant number, since it is smaller than the sum of its proper divisors (3391495200).

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

1297640160 is a wasteful number, since it uses less digits than its factorization.

1297640160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802 (or 791 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 1297640160 is about 36022.7727972182. The cubic root of 1297640160 is about 1090.7320952241.

The spelling of 1297640160 in words is "one billion, two hundred ninety-seven million, six hundred forty thousand, one hundred sixty".