1201228218 has 24 divisors (see below), whose sum is σ = 2699057088. Its totient is φ = 400409244.

The previous prime is 1201228201. The next prime is 1201228219. The reversal of 1201228218 is 8128221021.

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

It is a junction number, because it is equal to n+sod(n) for n = 1201228191 and 1201228200.

It is not an unprimeable number, because it can be changed into a prime (1201228219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1235346 + ... + 1236317.

It is an arithmetic number, because the mean of its divisors is an integer number (112460712).

Almost surely, 2^1201228218 is an apocalyptic number.

1201228218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1201228218 is an abundant number, since it is smaller than the sum of its proper divisors (1497828870).

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

1201228218 is an equidigital number, since it uses as much as digits as its factorization.

1201228218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471680 (or 2471668 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 1201228218 is about 34658.7394173533. The cubic root of 1201228218 is about 1063.0209945566.

Adding to 1201228218 its reverse (8128221021), we get a palindrome (9329449239).

The spelling of 1201228218 in words is "one billion, two hundred one million, two hundred twenty-eight thousand, two hundred eighteen".