3821981436 has 120 divisors (see below), whose sum is σ = 12297220320. Its totient is φ = 1007987328.

The previous prime is 3821981417. The next prime is 3821981477. The reversal of 3821981436 is 6341891283.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 3821981391 and 3821981400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 35331 + ... + 94298.

It is an arithmetic number, because the mean of its divisors is an integer number (102476836).

Almost surely, 2^3821981436 is an apocalyptic number.

3821981436 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

3821981436 is an abundant number, since it is smaller than the sum of its proper divisors (8475238884).

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

3821981436 is a wasteful number, since it uses less digits than its factorization.

3821981436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129665 (or 129654 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 3821981436 is about 61822.1759241779. The cubic root of 3821981436 is about 1563.4938997124.

The spelling of 3821981436 in words is "three billion, eight hundred twenty-one million, nine hundred eighty-one thousand, four hundred thirty-six".