3938641456 has 20 divisors (see below), whose sum is σ = 7632331192. Its totient is φ = 1969007616.

The previous prime is 3938641439. The next prime is 3938641471. The reversal of 3938641456 is 6541468393.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110335 + ... + 141601.

Almost surely, 2^3938641456 is an apocalyptic number.

It is an amenable number.

3938641456 is a deficient number, since it is larger than the sum of its proper divisors (3693689736).

3938641456 is a wasteful number, since it uses less digits than its factorization.

3938641456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39148 (or 39142 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 49.

The square root of 3938641456 is about 62758.5966700977. The cubic root of 3938641456 is about 1579.2424740168.

The spelling of 3938641456 in words is "three billion, nine hundred thirty-eight million, six hundred forty-one thousand, four hundred fifty-six".