3818561994 has 32 divisors (see below), whose sum is σ = 9138440640. Its totient is φ = 1174941936.

The previous prime is 3818561987. The next prime is 3818562079. The reversal of 3818561994 is 4991658183.

3818561994 is a `hidden beast` number, since 3 + 8 + 18 + 5 + 619 + 9 + 4 = 666.

3818561994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 3818561994.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2719072 + ... + 2720475.

It is an arithmetic number, because the mean of its divisors is an integer number (285576270).

Almost surely, 2^3818561994 is an apocalyptic number.

3818561994 is an abundant number, since it is smaller than the sum of its proper divisors (5319878646).

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

3818561994 is a wasteful number, since it uses less digits than its factorization.

3818561994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5439571 (or 5439565 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 3818561994 is about 61794.5142710904. The cubic root of 3818561994 is about 1563.0274861528.

The spelling of 3818561994 in words is "three billion, eight hundred eighteen million, five hundred sixty-one thousand, nine hundred ninety-four".