1208240640 has 180 divisors, whose sum is σ = 4202829774. Its totient is φ = 320790528.

The previous prime is 1208240599. The next prime is 1208240653. The reversal of 1208240640 is 460428021.

1208240640 is a `hidden beast` number, since 12 + 0 + 8 + 2 + 4 + 0 + 640 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 1204367616 + 3873024 = 34704^2 + 1968^2 .

It is a tau number, because it is divible by the number of its divisors (180).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5276046 + ... + 5276274.

Almost surely, 2^1208240640 is an apocalyptic number.

1208240640 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 1208240640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2101414887).

1208240640 is an abundant number, since it is smaller than the sum of its proper divisors (2994589134).

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

1208240640 is an frugal number, since it uses more digits than its factorization.

1208240640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 1208240640 is about 34759.7560405708. The cubic root of 1208240640 is about 1065.0855184915.

Adding to 1208240640 its reverse (460428021), we get a palindrome (1668668661).

The spelling of 1208240640 in words is "one billion, two hundred eight million, two hundred forty thousand, six hundred forty".