1297866240 has 400 divisors, whose sum is σ = 5080054320. Its totient is φ = 314081280.

The previous prime is 1297866233. The next prime is 1297866277. The reversal of 1297866240 is 426687921.

It is a happy number.

1297866240 is a `hidden beast` number, since 12 + 9 + 7 + 8 + 6 + 624 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2280676 + ... + 2281244.

Almost surely, 2^1297866240 is an apocalyptic number.

1297866240 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 1297866240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2540027160).

1297866240 is an abundant number, since it is smaller than the sum of its proper divisors (3782188080).

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

1297866240 is an equidigital number, since it uses as much as digits as its factorization.

1297866240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615 (or 590 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 1297866240 is about 36025.9106755124. The cubic root of 1297866240 is about 1090.7954354320.

The spelling of 1297866240 in words is "one billion, two hundred ninety-seven million, eight hundred sixty-six thousand, two hundred forty".