1226518200 has 144 divisors (see below), whose sum is σ = 4271783880. Its totient is φ = 327058560.

The previous prime is 1226518177. The next prime is 1226518207. The reversal of 1226518200 is 28156221.

It is a happy number.

1226518200 is a `hidden beast` number, since 1 + 2 + 2 + 651 + 8 + 2 + 0 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226518207) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 35982 + ... + 61218.

Almost surely, 2^1226518200 is an apocalyptic number.

1226518200 is a gapful number since it is divisible by the number (10) 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 1226518200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2135891940).

1226518200 is an abundant number, since it is smaller than the sum of its proper divisors (3045265680).

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

1226518200 is a wasteful number, since it uses less digits than its factorization.

1226518200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25268 (or 25247 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 1226518200 is about 35021.6818556734. The cubic root of 1226518200 is about 1070.4293266513.

The spelling of 1226518200 in words is "one billion, two hundred twenty-six million, five hundred eighteen thousand, two hundred".