3985621018 has 16 divisors (see below), whose sum is σ = 6001128000. Its totient is φ = 1985259232.

The previous prime is 3985621001. The next prime is 3985621043. The reversal of 3985621018 is 8101265893.

3985621018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 675003 + ... + 680881.

It is an arithmetic number, because the mean of its divisors is an integer number (375070500).

Almost surely, 2^3985621018 is an apocalyptic number.

3985621018 is a deficient number, since it is larger than the sum of its proper divisors (2015506982).

3985621018 is a wasteful number, since it uses less digits than its factorization.

3985621018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7109.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 3985621018 is about 63131.7750265269. The cubic root of 3985621018 is about 1585.4966672865.

The spelling of 3985621018 in words is "three billion, nine hundred eighty-five million, six hundred twenty-one thousand, eighteen".