1213840839 has 8 divisors (see below), whose sum is σ = 1620104832. Its totient is φ = 808402040.

The previous prime is 1213840813. The next prime is 1213840841. The reversal of 1213840839 is 9380483121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213840839 - 2⁸ = 1213840583 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213840797 and 1213840806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213840879) 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 7 ways as a sum of consecutive naturals, for example, 202857 + ... + 208754.

It is an arithmetic number, because the mean of its divisors is an integer number (202513104).

Almost surely, 2^1213840839 is an apocalyptic number.

1213840839 is a deficient number, since it is larger than the sum of its proper divisors (406263993).

1213840839 is an equidigital number, since it uses as much as digits as its factorization.

1213840839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412597.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 1213840839 is about 34840.2186990840. The cubic root of 1213840839 is about 1066.7285408227.

The spelling of 1213840839 in words is "one billion, two hundred thirteen million, eight hundred forty thousand, eight hundred thirty-nine".