1297206780 has 48 divisors (see below), whose sum is σ = 3749351424. Its totient is φ = 334762560.

The previous prime is 1297206767. The next prime is 1297206787. The reversal of 1297206780 is 876027921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297206787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346852 + ... + 350571.

It is an arithmetic number, because the mean of its divisors is an integer number (78111488).

Almost surely, 2^1297206780 is an apocalyptic number.

1297206780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1297206780 is an abundant number, since it is smaller than the sum of its proper divisors (2452144644).

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

1297206780 is a wasteful number, since it uses less digits than its factorization.

1297206780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697466 (or 697464 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 1297206780 is about 36016.7569334053. The cubic root of 1297206780 is about 1090.6106557775.

The spelling of 1297206780 in words is "one billion, two hundred ninety-seven million, two hundred six thousand, seven hundred eighty".