3988173638 has 16 divisors (see below), whose sum is σ = 6022066176. Its totient is φ = 1980861000.

The previous prime is 3988173613. The next prime is 3988173643. The reversal of 3988173638 is 8363718893.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 181895 + ... + 202637.

It is an arithmetic number, because the mean of its divisors is an integer number (376379136).

Almost surely, 2^3988173638 is an apocalyptic number.

3988173638 is a deficient number, since it is larger than the sum of its proper divisors (2033892538).

3988173638 is a wasteful number, since it uses less digits than its factorization.

3988173638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21379.

The product of its digits is 5225472, while the sum is 56.

The square root of 3988173638 is about 63151.9883930823. The cubic root of 3988173638 is about 1585.8350760129.

The spelling of 3988173638 in words is "three billion, nine hundred eighty-eight million, one hundred seventy-three thousand, six hundred thirty-eight".