3977221618 has 8 divisors (see below), whose sum is σ = 6104572848. Its totient is φ = 1942364004.

The previous prime is 3977221613. The next prime is 3977221643. The reversal of 3977221618 is 8161227793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (3977221613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23123296 + ... + 23123467.

It is an arithmetic number, because the mean of its divisors is an integer number (763071606).

Almost surely, 2^3977221618 is an apocalyptic number.

3977221618 is a deficient number, since it is larger than the sum of its proper divisors (2127351230).

3977221618 is a wasteful number, since it uses less digits than its factorization.

3977221618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46246808.

The product of its digits is 254016, while the sum is 46.

The square root of 3977221618 is about 63065.2171803126. The cubic root of 3977221618 is about 1584.3821118523.

The spelling of 3977221618 in words is "three billion, nine hundred seventy-seven million, two hundred twenty-one thousand, six hundred eighteen".