1984403666 has 24 divisors (see below), whose sum is σ = 3481956720. Its totient is φ = 845700072.

The previous prime is 1984403623. The next prime is 1984403669. The reversal of 1984403666 is 6663044891.

It is a self number, because there is not a number n which added to its sum of digits gives 1984403666.

It is not an unprimeable number, because it can be changed into a prime (1984403669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39020 + ... + 74103.

It is an arithmetic number, because the mean of its divisors is an integer number (145081530).

Almost surely, 2^1984403666 is an apocalyptic number.

1984403666 is a deficient number, since it is larger than the sum of its proper divisors (1497553054).

1984403666 is a wasteful number, since it uses less digits than its factorization.

1984403666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113318 (or 113311 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 47.

The square root of 1984403666 is about 44546.6459567945. The cubic root of 1984403666 is about 1256.6374748390.

The spelling of 1984403666 in words is "one billion, nine hundred eighty-four million, four hundred three thousand, six hundred sixty-six".