1211444256 has 192 divisors, whose sum is σ = 3689280000. Its totient is φ = 347086080.

The previous prime is 1211444249. The next prime is 1211444279. The reversal of 1211444256 is 6524441121.

It is a super-3 number, since 3×1211444256³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2427495 + ... + 2427993.

It is an arithmetic number, because the mean of its divisors is an integer number (19215000).

Almost surely, 2^1211444256 is an apocalyptic number.

1211444256 is a gapful number since it is divisible by the number (16) 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 1211444256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1844640000).

1211444256 is an abundant number, since it is smaller than the sum of its proper divisors (2477835744).

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

1211444256 is a wasteful number, since it uses less digits than its factorization.

1211444256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564 (or 534 counting only the distinct ones).

The product of its digits is 7680, while the sum is 30.

The square root of 1211444256 is about 34805.8077912293. The cubic root of 1211444256 is about 1066.0260358057.

Adding to 1211444256 its reverse (6524441121), we get a palindrome (7735885377).

The spelling of 1211444256 in words is "one billion, two hundred eleven million, four hundred forty-four thousand, two hundred fifty-six".