811918642 has 8 divisors (see below), whose sum is σ = 1218654000. Its totient is φ = 405700644.

The previous prime is 811918633. The next prime is 811918643. The reversal of 811918642 is 246819118.

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

It is a junction number, because it is equal to n+sod(n) for n = 811918595 and 811918604.

It is not an unprimeable number, because it can be changed into a prime (811918643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125392 + ... + 131707.

It is an arithmetic number, because the mean of its divisors is an integer number (152331750).

Almost surely, 2^811918642 is an apocalyptic number.

811918642 is a deficient number, since it is larger than the sum of its proper divisors (406735358).

811918642 is a wasteful number, since it uses less digits than its factorization.

811918642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258680.

The product of its digits is 27648, while the sum is 40.

The square root of 811918642 is about 28494.1861087486. The cubic root of 811918642 is about 932.9051796693.

The spelling of 811918642 in words is "eight hundred eleven million, nine hundred eighteen thousand, six hundred forty-two".