1297388077920 has 1728 divisors, whose sum is σ = 5420904652800. Its totient is φ = 281014272000.

The previous prime is 1297388077919. The next prime is 1297388077957. The reversal of 1297388077920 is 297708837921.

1297388077920 is a `hidden beast` number, since 12 + 97 + 388 + 0 + 77 + 92 + 0 = 666.

It is a congruent number.

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, 6519537981 + ... + 6519538179.

It is an arithmetic number, because the mean of its divisors is an integer number (3137097600).

Almost surely, 2^{1297388077920} is an apocalyptic number.

1297388077920 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 1297388077920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2710452326400).

1297388077920 is an abundant number, since it is smaller than the sum of its proper divisors (4123516574880).

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

1297388077920 is a wasteful number, since it uses less digits than its factorization.

1297388077920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 21337344, while the sum is 63.

The spelling of 1297388077920 in words is "one trillion, two hundred ninety-seven billion, three hundred eighty-eight million, seventy-seven thousand, nine hundred twenty".