1297309440 has 432 divisors, whose sum is σ = 5060224512. Its totient is φ = 277413888.

The previous prime is 1297309439. The next prime is 1297309501. The reversal of 1297309440 is 449037921.

It is a super-2 number, since 2×1297309440² = 3366023566226227200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7768237 + ... + 7768403.

Almost surely, 2^1297309440 is an apocalyptic number.

1297309440 is a gapful number since it is divisible by the number (10) 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 1297309440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2530112256).

1297309440 is an abundant number, since it is smaller than the sum of its proper divisors (3762915072).

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

1297309440 is a wasteful number, since it uses less digits than its factorization.

1297309440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 1297309440 is about 36018.1820751686. The cubic root of 1297309440 is about 1090.6394250630.

The spelling of 1297309440 in words is "one billion, two hundred ninety-seven million, three hundred nine thousand, four hundred forty".