1212055650 has 120 divisors (see below), whose sum is σ = 3626931924. Its totient is φ = 298339200.

The previous prime is 1212055591. The next prime is 1212055673. The reversal of 1212055650 is 565502121.

1212055650 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 0 + 5 + 5 + 650 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 67519089 + 1144536561 = 8217^2 + 33831^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 41140 + ... + 64160.

Almost surely, 2^1212055650 is an apocalyptic number.

1212055650 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 1212055650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1813465962).

1212055650 is an abundant number, since it is smaller than the sum of its proper divisors (2414876274).

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

1212055650 is a wasteful number, since it uses less digits than its factorization.

1212055650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23058 (or 23044 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 1212055650 is about 34814.5896141259. The cubic root of 1212055650 is about 1066.2053403302.

Adding to 1212055650 its reverse (565502121), we get a palindrome (1777557771).

The spelling of 1212055650 in words is "one billion, two hundred twelve million, fifty-five thousand, six hundred fifty".