1217522340 has 144 divisors (see below), whose sum is σ = 3845849280. Its totient is φ = 323326080.

The previous prime is 1217522329. The next prime is 1217522353. The reversal of 1217522340 is 432257121.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1841610 + ... + 1842270.

Almost surely, 2^1217522340 is an apocalyptic number.

1217522340 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 1217522340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1922924640).

1217522340 is an abundant number, since it is smaller than the sum of its proper divisors (2628326940).

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

1217522340 is a wasteful number, since it uses less digits than its factorization.

1217522340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064 (or 1050 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 1217522340 is about 34893.0127676015. The cubic root of 1217522340 is about 1067.8058920051.

Adding to 1217522340 its reverse (432257121), we get a palindrome (1649779461).

The spelling of 1217522340 in words is "one billion, two hundred seventeen million, five hundred twenty-two thousand, three hundred forty".