1212243340 has 108 divisors (see below), whose sum is σ = 3255342048. Its totient is φ = 377805120.

The previous prime is 1212243299. The next prime is 1212243341. The reversal of 1212243340 is 433422121.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (1212243341) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 113469 + ... + 123691.

It is an arithmetic number, because the mean of its divisors is an integer number (30142056).

Almost surely, 2^1212243340 is an apocalyptic number.

1212243340 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 1212243340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1627671024).

1212243340 is an abundant number, since it is smaller than the sum of its proper divisors (2043098708).

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

1212243340 is a wasteful number, since it uses less digits than its factorization.

1212243340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10268 (or 10248 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1212243340 is about 34817.2850750888. The cubic root of 1212243340 is about 1066.2603723885.

Adding to 1212243340 its reverse (433422121), we get a palindrome (1645665461).

The spelling of 1212243340 in words is "one billion, two hundred twelve million, two hundred forty-three thousand, three hundred forty".