389978777618 has 16 divisors (see below), whose sum is σ = 615768229440. Its totient is φ = 184723110000.

The previous prime is 389978777609. The next prime is 389978777627. The reversal of 389978777618 is 816777879983.

It is an interprime number because it is at equal distance from previous prime (389978777609) and next prime (389978777627).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3311243 + ... + 3426993.

It is an arithmetic number, because the mean of its divisors is an integer number (38485514340).

Almost surely, 2^389978777618 is an apocalyptic number.

389978777618 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

389978777618 is a deficient number, since it is larger than the sum of its proper divisors (225789451822).

389978777618 is a wasteful number, since it uses less digits than its factorization.

389978777618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204433.

The product of its digits is 1792336896, while the sum is 80.

The spelling of 389978777618 in words is "three hundred eighty-nine billion, nine hundred seventy-eight million, seven hundred seventy-seven thousand, six hundred eighteen".