1220135400 has 480 divisors, whose sum is σ = 4764070080. Its totient is φ = 286848000.

The previous prime is 1220135387. The next prime is 1220135461. The reversal of 1220135400 is 45310221.

1220135400 is a `hidden beast` number, since 122 + 0 + 1 + 3 + 540 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 7306117 + ... + 7306283.

It is an arithmetic number, because the mean of its divisors is an integer number (9925146).

Almost surely, 2^1220135400 is an apocalyptic number.

1220135400 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 1220135400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2382035040).

1220135400 is an abundant number, since it is smaller than the sum of its proper divisors (3543934680).

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

1220135400 is a wasteful number, since it uses less digits than its factorization.

1220135400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1220135400 is about 34930.4365847322. The cubic root of 1220135400 is about 1068.5692584476.

Adding to 1220135400 its reverse (45310221), we get a palindrome (1265445621).

The spelling of 1220135400 in words is "one billion, two hundred twenty million, one hundred thirty-five thousand, four hundred".