1297822428 has 216 divisors, whose sum is σ = 3950419200. Its totient is φ = 358053696.

The previous prime is 1297822423. The next prime is 1297822429. The reversal of 1297822428 is 8242287921.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297822423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 9336783 + ... + 9336921.

Almost surely, 2^1297822428 is an apocalyptic number.

1297822428 is a gapful number since it is divisible by the number (18) 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 1297822428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1975209600).

1297822428 is an abundant number, since it is smaller than the sum of its proper divisors (2652596772).

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

1297822428 is a wasteful number, since it uses less digits than its factorization.

1297822428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 297 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 1297822428 is about 36025.3026080282. The cubic root of 1297822428 is about 1090.7831613199.

The spelling of 1297822428 in words is "one billion, two hundred ninety-seven million, eight hundred twenty-two thousand, four hundred twenty-eight".