1297197720 has 512 divisors, whose sum is σ = 5428684800. Its totient is φ = 268240896.

The previous prime is 1297197709. The next prime is 1297197731. The reversal of 1297197720 is 277917921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1297197709) and next prime (1297197731).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6584662 + ... + 6584858.

It is an arithmetic number, because the mean of its divisors is an integer number (10602900).

Almost surely, 2^1297197720 is an apocalyptic number.

1297197720 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 1297197720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2714342400).

1297197720 is an abundant number, since it is smaller than the sum of its proper divisors (4131487080).

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

1297197720 is a wasteful number, since it uses less digits than its factorization.

1297197720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 111132, while the sum is 45.

The square root of 1297197720 is about 36016.6311583968. The cubic root of 1297197720 is about 1090.6081167437.

The spelling of 1297197720 in words is "one billion, two hundred ninety-seven million, one hundred ninety-seven thousand, seven hundred twenty".