1256812200 has 240 divisors, whose sum is σ = 4989130080. Its totient is φ = 287245440.

The previous prime is 1256812187. The next prime is 1256812201. The reversal of 1256812200 is 22186521.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (1256812201) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 107859 + ... + 118941.

It is an arithmetic number, because the mean of its divisors is an integer number (20788042).

Almost surely, 2^1256812200 is an apocalyptic number.

1256812200 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 1256812200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2494565040).

1256812200 is an abundant number, since it is smaller than the sum of its proper divisors (3732317880).

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

1256812200 is a wasteful number, since it uses less digits than its factorization.

1256812200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11118 (or 11100 counting only the distinct ones).

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

The square root of 1256812200 is about 35451.5472158833. The cubic root of 1256812200 is about 1079.1706596024.

Adding to 1256812200 its reverse (22186521), we get a palindrome (1278998721).

The spelling of 1256812200 in words is "one billion, two hundred fifty-six million, eight hundred twelve thousand, two hundred".