1211243439 has 48 divisors (see below), whose sum is σ = 1949266944. Its totient is φ = 655047360.

The previous prime is 1211243413. The next prime is 1211243459. The reversal of 1211243439 is 9343421121.

It is not a de Polignac number, because 1211243439 - 2⁹ = 1211242927 is a prime.

It is a super-2 number, since 2×1211243439² = 2934221337041093442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211243459) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 947869 + ... + 949145.

It is an arithmetic number, because the mean of its divisors is an integer number (40609728).

Almost surely, 2^1211243439 is an apocalyptic number.

1211243439 is a deficient number, since it is larger than the sum of its proper divisors (738023505).

1211243439 is a wasteful number, since it uses less digits than its factorization.

1211243439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396 (or 1365 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 1211243439 is about 34802.9228513928. The cubic root of 1211243439 is about 1065.9671287122.

It can be divided in two parts, 1211 and 243439, that added together give a triangular number (244650 = T₆₉₉).

The spelling of 1211243439 in words is "one billion, two hundred eleven million, two hundred forty-three thousand, four hundred thirty-nine".