1212220240 has 320 divisors, whose sum is σ = 3702620160. Its totient is φ = 358225920.

The previous prime is 1212220237. The next prime is 1212220259. The reversal of 1212220240 is 420222121.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15344521 + ... + 15344599.

It is an arithmetic number, because the mean of its divisors is an integer number (11570688).

Almost surely, 2^1212220240 is an apocalyptic number.

1212220240 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 1212220240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1851310080).

1212220240 is an abundant number, since it is smaller than the sum of its proper divisors (2490399920).

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

1212220240 is a wasteful number, since it uses less digits than its factorization.

1212220240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1212220240 is about 34816.9533417271. The cubic root of 1212220240 is about 1066.2535996089.

Adding to 1212220240 its reverse (420222121), we get a palindrome (1632442361).

The spelling of 1212220240 in words is "one billion, two hundred twelve million, two hundred twenty thousand, two hundred forty".