1297439856 has 100 divisors (see below), whose sum is σ = 3776596824. Its totient is φ = 430012800.

The previous prime is 1297439849. The next prime is 1297439861. The reversal of 1297439856 is 6589347921.

1297439856 is a `hidden beast` number, since 129 + 7 + 439 + 85 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 231811 + ... + 237341.

Almost surely, 2^1297439856 is an apocalyptic number.

1297439856 is a gapful number since it is divisible by the number (16) 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 1297439856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1888298412).

1297439856 is an abundant number, since it is smaller than the sum of its proper divisors (2479156968).

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

1297439856 is a wasteful number, since it uses less digits than its factorization.

1297439856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5732 (or 5717 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 1297439856 is about 36019.9924486389. The cubic root of 1297439856 is about 1090.6759704599.

The spelling of 1297439856 in words is "one billion, two hundred ninety-seven million, four hundred thirty-nine thousand, eight hundred fifty-six".