1856220436 has 12 divisors (see below), whose sum is σ = 3712440928. Its totient is φ = 795523032.

The previous prime is 1856220433. The next prime is 1856220469. The reversal of 1856220436 is 6340226581.

1856220436 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1856220395 and 1856220404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1856220433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33146766 + ... + 33146821.

Almost surely, 2^1856220436 is an apocalyptic number.

It is an amenable number.

1856220436 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1856220436 is a wasteful number, since it uses less digits than its factorization.

1856220436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66293598 (or 66293596 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 1856220436 is about 43083.8767522144. The cubic root of 1856220436 is about 1228.9753813104.

The spelling of 1856220436 in words is "one billion, eight hundred fifty-six million, two hundred twenty thousand, four hundred thirty-six".