1222125540 has 192 divisors, whose sum is σ = 3732341760. Its totient is φ = 298045440.

The previous prime is 1222125521. The next prime is 1222125547. The reversal of 1222125540 is 455212221.

It is a self number, because there is not a number n which added to its sum of digits gives 1222125540.

It is not an unprimeable number, because it can be changed into a prime (1222125547) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2639349 + ... + 2639811.

It is an arithmetic number, because the mean of its divisors is an integer number (19439280).

Almost surely, 2^1222125540 is an apocalyptic number.

1222125540 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 1222125540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1866170880).

1222125540 is an abundant number, since it is smaller than the sum of its proper divisors (2510216220).

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

1222125540 is a wasteful number, since it uses less digits than its factorization.

1222125540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582 (or 580 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 1222125540 is about 34958.9121684300. The cubic root of 1222125540 is about 1069.1499172964.

Adding to 1222125540 its reverse (455212221), we get a palindrome (1677337761).

The spelling of 1222125540 in words is "one billion, two hundred twenty-two million, one hundred twenty-five thousand, five hundred forty".