1297779056 has 20 divisors (see below), whose sum is σ = 2873653872. Its totient is φ = 556190976.

The previous prime is 1297779047. The next prime is 1297779073. The reversal of 1297779056 is 6509777921.

It is a super-2 number, since 2×1297779056² = 3368460956384502272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1297778989 and 1297779007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5793545 + ... + 5793768.

Almost surely, 2^1297779056 is an apocalyptic number.

1297779056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1297779056 is an abundant number, since it is smaller than the sum of its proper divisors (1575874816).

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

1297779056 is a wasteful number, since it uses less digits than its factorization.

1297779056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11587328 (or 11587322 counting only the distinct ones).

The product of its (nonzero) digits is 1666980, while the sum is 53.

The square root of 1297779056 is about 36024.7006372017. The cubic root of 1297779056 is about 1090.7710102034.

The spelling of 1297779056 in words is "one billion, two hundred ninety-seven million, seven hundred seventy-nine thousand, fifty-six".