1217378240 has 112 divisors (see below), whose sum is σ = 3229843680. Its totient is φ = 433950720.

The previous prime is 1217378237. The next prime is 1217378303. The reversal of 1217378240 is 428737121.

It is a self number, because there is not a number n which added to its sum of digits gives 1217378240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115595 + ... + 125685.

It is an arithmetic number, because the mean of its divisors is an integer number (28837890).

Almost surely, 2^1217378240 is an apocalyptic number.

1217378240 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 1217378240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1614921840).

1217378240 is an abundant number, since it is smaller than the sum of its proper divisors (2012465440).

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

1217378240 is a wasteful number, since it uses less digits than its factorization.

1217378240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10150 (or 10140 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 1217378240 is about 34890.9478231819. The cubic root of 1217378240 is about 1067.7637635790.

The spelling of 1217378240 in words is "one billion, two hundred seventeen million, three hundred seventy-eight thousand, two hundred forty".