812236139 has 18 divisors (see below), whose sum is σ = 960932268. Its totient is φ = 680565600.

The previous prime is 812236133. The next prime is 812236153. The reversal of 812236139 is 931632218.

It is not a de Polignac number, because 812236139 - 2⁴ = 812236123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 812236099 and 812236108.

It is not an unprimeable number, because it can be changed into a prime (812236133) 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 17 ways as a sum of consecutive naturals, for example, 1228469 + ... + 1229129.

It is an arithmetic number, because the mean of its divisors is an integer number (53385126).

Almost surely, 2^812236139 is an apocalyptic number.

812236139 is a deficient number, since it is larger than the sum of its proper divisors (148696129).

812236139 is an equidigital number, since it uses as much as digits as its factorization.

812236139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359 (or 685 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 812236139 is about 28499.7568235240. The cubic root of 812236139 is about 933.0267665625.

The spelling of 812236139 in words is "eight hundred twelve million, two hundred thirty-six thousand, one hundred thirty-nine".