1297557976 has 64 divisors (see below), whose sum is σ = 2866459680. Its totient is φ = 542868480.

The previous prime is 1297557973. The next prime is 1297557977. The reversal of 1297557976 is 6797557921.

It is a self number, because there is not a number n which added to its sum of digits gives 1297557976.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297557971) 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, 452740 + ... + 455596.

Almost surely, 2^1297557976 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 1297557976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1433229840).

1297557976 is an abundant number, since it is smaller than the sum of its proper divisors (1568901704).

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

1297557976 is a wasteful number, since it uses less digits than its factorization.

1297557976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3284 (or 3280 counting only the distinct ones).

The product of its digits is 8334900, while the sum is 58.

The square root of 1297557976 is about 36021.6320563075. The cubic root of 1297557976 is about 1090.7090681370.

Subtracting 1297557976 from its reverse (6797557921), we obtain a palindrome (5499999945).

It can be divided in two parts, 129755 and 7976, that added together give a palindrome (137731).

The spelling of 1297557976 in words is "one billion, two hundred ninety-seven million, five hundred fifty-seven thousand, nine hundred seventy-six".