1224213540 has 192 divisors, whose sum is σ = 3901685760. Its totient is φ = 284085760.

The previous prime is 1224213533. The next prime is 1224213583. The reversal of 1224213540 is 453124221.

It is a self number, because there is not a number n which added to its sum of digits gives 1224213540.

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, 3196189 + ... + 3196571.

It is an arithmetic number, because the mean of its divisors is an integer number (20321280).

Almost surely, 2^1224213540 is an apocalyptic number.

1224213540 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 1224213540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1950842880).

1224213540 is an abundant number, since it is smaller than the sum of its proper divisors (2677472220).

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

1224213540 is a wasteful number, since it uses less digits than its factorization.

1224213540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602 (or 600 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1224213540 is about 34988.7630533004. The cubic root of 1224213540 is about 1069.7584513128.

Adding to 1224213540 its reverse (453124221), we get a palindrome (1677337761).

The spelling of 1224213540 in words is "one billion, two hundred twenty-four million, two hundred thirteen thousand, five hundred forty".