1222555140 has 96 divisors (see below), whose sum is σ = 3849471360. Its totient is φ = 322075008.

The previous prime is 1222555129. The next prime is 1222555141. The reversal of 1222555140 is 415552221.

1222555140 is a `hidden beast` number, since 122 + 25 + 5 + 514 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1222555141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31182 + ... + 58458.

It is an arithmetic number, because the mean of its divisors is an integer number (40098660).

Almost surely, 2^1222555140 is an apocalyptic number.

1222555140 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 1222555140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1924735680).

1222555140 is an abundant number, since it is smaller than the sum of its proper divisors (2626916220).

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

1222555140 is a wasteful number, since it uses less digits than its factorization.

1222555140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27378 (or 27370 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 1222555140 is about 34965.0559845112. The cubic root of 1222555140 is about 1069.2751780223.

The spelling of 1222555140 in words is "one billion, two hundred twenty-two million, five hundred fifty-five thousand, one hundred forty".