1220535450 has 72 divisors (see below), whose sum is σ = 3290719068. Its totient is φ = 324330240.

The previous prime is 1220535443. The next prime is 1220535461. The reversal of 1220535450 is 545350221.

It is a happy number.

1220535450 is a `hidden beast` number, since 1 + 2 + 205 + 3 + 5 + 450 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 448973721 + 771561729 = 21189^2 + 27777^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 127222 + ... + 136478.

Almost surely, 2^1220535450 is an apocalyptic number.

1220535450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220535450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1645359534).

1220535450 is an abundant number, since it is smaller than the sum of its proper divisors (2070183618).

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

1220535450 is a wasteful number, since it uses less digits than its factorization.

1220535450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9568 (or 9560 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 1220535450 is about 34936.1624967597. The cubic root of 1220535450 is about 1068.6860308486.

Adding to 1220535450 its reverse (545350221), we get a palindrome (1765885671).

The spelling of 1220535450 in words is "one billion, two hundred twenty million, five hundred thirty-five thousand, four hundred fifty".