1211440043 has 16 divisors (see below), whose sum is σ = 1400426496. Its totient is φ = 1035699840.

The previous prime is 1211440007. The next prime is 1211440049. The reversal of 1211440043 is 3400441121.

It is not a de Polignac number, because 1211440043 - 2¹⁴ = 1211423659 is a prime.

It is a super-3 number, since 3×1211440043³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211439997 and 1211440024.

It is not an unprimeable number, because it can be changed into a prime (1211440049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399230 + ... + 402252.

It is an arithmetic number, because the mean of its divisors is an integer number (87526656).

Almost surely, 2^1211440043 is an apocalyptic number.

1211440043 is a deficient number, since it is larger than the sum of its proper divisors (188986453).

1211440043 is a wasteful number, since it uses less digits than its factorization.

1211440043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5194.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1211440043 is about 34805.7472696680. The cubic root of 1211440043 is about 1066.0248000430.

Adding to 1211440043 its reverse (3400441121), we get a palindrome (4611881164).

The spelling of 1211440043 in words is "one billion, two hundred eleven million, four hundred forty thousand, forty-three".