812436861 has 8 divisors (see below), whose sum is σ = 1112526304. Its totient is φ = 526986000.

The previous prime is 812436839. The next prime is 812436887. The reversal of 812436861 is 168634218.

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

It is not a de Polignac number, because 812436861 - 2⁷ = 812436733 is a prime.

It is a super-2 number, since 2×812436861² = 1320107306223066642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812436161) 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, 3659515 + ... + 3659736.

It is an arithmetic number, because the mean of its divisors is an integer number (139065788).

Almost surely, 2^812436861 is an apocalyptic number.

It is an amenable number.

812436861 is a deficient number, since it is larger than the sum of its proper divisors (300089443).

812436861 is a wasteful number, since it uses less digits than its factorization.

812436861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7319291.

The product of its digits is 55296, while the sum is 39.

The square root of 812436861 is about 28503.2780746356. The cubic root of 812436861 is about 933.1036176016.

The spelling of 812436861 in words is "eight hundred twelve million, four hundred thirty-six thousand, eight hundred sixty-one".