3938146638 has 16 divisors (see below), whose sum is σ = 8043874560. Its totient is φ = 1284785336.

The previous prime is 3938146631. The next prime is 3938146649. The reversal of 3938146638 is 8366418393.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3938146631) 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 7 ways as a sum of consecutive naturals, for example, 6982248 + ... + 6982811.

It is an arithmetic number, because the mean of its divisors is an integer number (502742160).

Almost surely, 2^3938146638 is an apocalyptic number.

3938146638 is an abundant number, since it is smaller than the sum of its proper divisors (4105727922).

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

3938146638 is a wasteful number, since it uses less digits than its factorization.

3938146638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13965111.

The product of its digits is 2239488, while the sum is 51.

The square root of 3938146638 is about 62754.6543134452. The cubic root of 3938146638 is about 1579.1763369711.

The spelling of 3938146638 in words is "three billion, nine hundred thirty-eight million, one hundred forty-six thousand, six hundred thirty-eight".