1856381652 has 60 divisors (see below), whose sum is σ = 4911488736. Its totient is φ = 611329680.

The previous prime is 1856381617. The next prime is 1856381671. The reversal of 1856381652 is 2561836581.

1856381652 is a `hidden beast` number, since 1 + 8 + 5 + 638 + 1 + 6 + 5 + 2 = 666.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 1856381598 and 1856381607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7624 + ... + 61407.

Almost surely, 2^1856381652 is an apocalyptic number.

1856381652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1856381652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2455744368).

1856381652 is an abundant number, since it is smaller than the sum of its proper divisors (3055107084).

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

1856381652 is a wasteful number, since it uses less digits than its factorization.

1856381652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69130 (or 69119 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 1856381652 is about 43085.7476667169. The cubic root of 1856381652 is about 1229.0109598360.

The spelling of 1856381652 in words is "one billion, eight hundred fifty-six million, three hundred eighty-one thousand, six hundred fifty-two".