1220001200 has 60 divisors (see below), whose sum is σ = 3197523768. Its totient is φ = 443635200.

The previous prime is 1220001199. The next prime is 1220001221. The reversal of 1220001200 is 21000221.

It is a Harshad number since it is a multiple of its sum of digits (8).

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 11 ways as a sum of consecutive naturals, for example, 134237 + ... + 143036.

Almost surely, 2^1220001200 is an apocalyptic number.

1220001200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220001200 is an abundant number, since it is smaller than the sum of its proper divisors (1977522568).

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

1220001200 is a wasteful number, since it uses less digits than its factorization.

1220001200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277302 (or 277291 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1220001200 is about 34928.5155710918. The cubic root of 1220001200 is about 1068.5300804864.

Adding to 1220001200 its reverse (21000221), we get a palindrome (1241001421).

The spelling of 1220001200 in words is "one billion, two hundred twenty million, one thousand, two hundred".