1297740805920 has 1728 divisors, whose sum is σ = 5283344102400. Its totient is φ = 288933765120.

The previous prime is 1297740805919. The next prime is 1297740805937. The reversal of 1297740805920 is 295080477921.

1297740805920 is a `hidden beast` number, since 1 + 2 + 9 + 7 + 7 + 40 + 8 + 0 + 592 + 0 = 666.

It is a super-2 number, since 2×1297740805920² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 18278039485 + ... + 18278039555.

It is an arithmetic number, because the mean of its divisors is an integer number (3057490800).

Almost surely, 2^{1297740805920} is an apocalyptic number.

1297740805920 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 1297740805920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2641672051200).

1297740805920 is an abundant number, since it is smaller than the sum of its proper divisors (3985603296480).

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

1297740805920 is a wasteful number, since it uses less digits than its factorization.

1297740805920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The spelling of 1297740805920 in words is "one trillion, two hundred ninety-seven billion, seven hundred forty million, eight hundred five thousand, nine hundred twenty".