1220955912 has 384 divisors, whose sum is σ = 4094064000. Its totient is φ = 324280320.

The previous prime is 1220955877. The next prime is 1220955913. The reversal of 1220955912 is 2195590221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1220955913) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20694139 + ... + 20694197.

It is an arithmetic number, because the mean of its divisors is an integer number (10661625).

Almost surely, 2^1220955912 is an apocalyptic number.

1220955912 is a gapful number since it is divisible by the number (12) 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 1220955912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2047032000).

1220955912 is an abundant number, since it is smaller than the sum of its proper divisors (2873108088).

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

1220955912 is a wasteful number, since it uses less digits than its factorization.

1220955912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The square root of 1220955912 is about 34942.1795542293. The cubic root of 1220955912 is about 1068.8087339016.

It can be divided in two parts, 12209 and 55912, that added together give a square (68121 = 261²).

The spelling of 1220955912 in words is "one billion, two hundred twenty million, nine hundred fifty-five thousand, nine hundred twelve".