3989646438 has 16 divisors (see below), whose sum is σ = 7983691776. Its totient is φ = 1329149000.

The previous prime is 3989646431. The next prime is 3989646457. The reversal of 3989646438 is 8346469893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3989646431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171438 + ... + 193313.

It is an arithmetic number, because the mean of its divisors is an integer number (498980736).

Almost surely, 2^3989646438 is an apocalyptic number.

3989646438 is an abundant number, since it is smaller than the sum of its proper divisors (3994045338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3989646438 is a wasteful number, since it uses less digits than its factorization.

3989646438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366579.

The product of its digits is 26873856, while the sum is 60.

The square root of 3989646438 is about 63163.6480738724. The cubic root of 3989646438 is about 1586.0302639746.

The spelling of 3989646438 in words is "three billion, nine hundred eighty-nine million, six hundred forty-six thousand, four hundred thirty-eight".