3938863428 has 18 divisors (see below), whose sum is σ = 9956571534. Its totient is φ = 1312954464.

The previous prime is 3938863427. The next prime is 3938863447. The reversal of 3938863428 is 8243688393.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3132417024 + 806446404 = 55968^2 + 28398^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×3938863428³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (3938863427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54706401 + ... + 54706472.

It is an arithmetic number, because the mean of its divisors is an integer number (553142863).

Almost surely, 2^3938863428 is an apocalyptic number.

It is an amenable number.

3938863428 is an abundant number, since it is smaller than the sum of its proper divisors (6017708106).

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

3938863428 is a wasteful number, since it uses less digits than its factorization.

3938863428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109412883 (or 109412878 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 54.

The square root of 3938863428 is about 62760.3651041005. The cubic root of 3938863428 is about 1579.2721408473.

The spelling of 3938863428 in words is "three billion, nine hundred thirty-eight million, eight hundred sixty-three thousand, four hundred twenty-eight".