1818396856 has 8 divisors (see below), whose sum is σ = 3409494120. Its totient is φ = 909198424.

The previous prime is 1818396851. The next prime is 1818396883. The reversal of 1818396856 is 6586938181.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1818396797 and 1818396806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818396851) 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 as a sum of consecutive naturals, namely, 113649796 + ... + 113649811.

It is an arithmetic number, because the mean of its divisors is an integer number (426186765).

Almost surely, 2^1818396856 is an apocalyptic number.

It is an amenable number.

1818396856 is a deficient number, since it is larger than the sum of its proper divisors (1591097264).

1818396856 is a wasteful number, since it uses less digits than its factorization.

1818396856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227299613 (or 227299609 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 55.

The square root of 1818396856 is about 42642.6647384987. The cubic root of 1818396856 is about 1220.5705599621.

The spelling of 1818396856 in words is "one billion, eight hundred eighteen million, three hundred ninety-six thousand, eight hundred fifty-six".