3818561988 has 12 divisors (see below), whose sum is σ = 8909978000. Its totient is φ = 1272853992.

The previous prime is 3818561987. The next prime is 3818562079. The reversal of 3818561988 is 8891658183.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (3818561983) 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, 159106738 + ... + 159106761.

Almost surely, 2^3818561988 is an apocalyptic number.

It is an amenable number.

3818561988 is an abundant number, since it is smaller than the sum of its proper divisors (5091416012).

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

3818561988 is a wasteful number, since it uses less digits than its factorization.

3818561988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318213506 (or 318213504 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 57.

The square root of 3818561988 is about 61794.5142225424. The cubic root of 3818561988 is about 1563.0274853341.

The spelling of 3818561988 in words is "three billion, eight hundred eighteen million, five hundred sixty-one thousand, nine hundred eighty-eight".