1211440536 has 128 divisors (see below), whose sum is σ = 3607934400. Its totient is φ = 379966464.

The previous prime is 1211440493. The next prime is 1211440583. The reversal of 1211440536 is 6350441121.

It is a happy number.

1211440536 is a `hidden beast` number, since 1 + 211 + 440 + 5 + 3 + 6 = 666.

It is a super-3 number, since 3×1211440536³ (a number of 28 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 295396 + ... + 299468.

Almost surely, 2^1211440536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211440536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1803967200).

1211440536 is an abundant number, since it is smaller than the sum of its proper divisors (2396493864).

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

1211440536 is an equidigital number, since it uses as much as digits as its factorization.

1211440536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4117 (or 4095 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1211440536 is about 34805.7543518310. The cubic root of 1211440536 is about 1066.0249446506.

Adding to 1211440536 its reverse (6350441121), we get a palindrome (7561881657).

It can be divided in two parts, 12114 and 40536, that added together give a triangular number (52650 = T₃₂₄).

The spelling of 1211440536 in words is "one billion, two hundred eleven million, four hundred forty thousand, five hundred thirty-six".