1297820208 has 80 divisors (see below), whose sum is σ = 3468635136. Its totient is φ = 417711360.

The previous prime is 1297820131. The next prime is 1297820219. The reversal of 1297820208 is 8020287921.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1015666 + ... + 1016942.

Almost surely, 2^1297820208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1297820208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1734317568).

1297820208 is an abundant number, since it is smaller than the sum of its proper divisors (2170814928).

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

1297820208 is a wasteful number, since it uses less digits than its factorization.

1297820208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002 (or 1996 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 1297820208 is about 36025.2717963376. The cubic root of 1297820208 is about 1090.7825393704.

The spelling of 1297820208 in words is "one billion, two hundred ninety-seven million, eight hundred twenty thousand, two hundred eight".