1181213839 has 12 divisors (see below), whose sum is σ = 1354308336. Its totient is φ = 1026210432.

The previous prime is 1181213833. The next prime is 1181213849. The reversal of 1181213839 is 9383121811.

It is not a de Polignac number, because 1181213839 - 2¹⁹ = 1180689551 is a prime.

It is a super-2 number, since 2×1181213839² = 2790532266890235842, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1181213798 and 1181213807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181213833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 202699 + ... + 208444.

It is an arithmetic number, because the mean of its divisors is an integer number (112859028).

Almost surely, 2^1181213839 is an apocalyptic number.

1181213839 is a deficient number, since it is larger than the sum of its proper divisors (173094497).

1181213839 is a wasteful number, since it uses less digits than its factorization.

1181213839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411186 (or 411173 counting only the distinct ones).

The product of its digits is 10368, while the sum is 37.

The square root of 1181213839 is about 34368.7916430008. The cubic root of 1181213839 is about 1057.0840229327.

It can be divided in two parts, 11812 and 13839, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 1181213839 in words is "one billion, one hundred eighty-one million, two hundred thirteen thousand, eight hundred thirty-nine".