381978385936 has 45 divisors (see below), whose sum is σ = 860952025101. Its totient is φ = 163697606016.

The previous prime is 381978385931. The next prime is 381978385939. The reversal of 381978385936 is 639583879183.

The square root of 381978385936 is 618044.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 370369616400 + 11608769536 = 608580^2 + 107744^2 .

It is not an unprimeable number, because it can be changed into a prime (381978385931) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 17294196 + ... + 17316268.

Almost surely, 2^381978385936 is an apocalyptic number.

381978385936 is the 618044-th square number.

It is an amenable number.

381978385936 is an abundant number, since it is smaller than the sum of its proper divisors (478973639165).

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

381978385936 is an frugal number, since it uses more digits than its factorization.

381978385936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44168 (or 22082 counting only the distinct ones).

The product of its digits is 235146240, while the sum is 70.

The spelling of 381978385936 in words is "three hundred eighty-one billion, nine hundred seventy-eight million, three hundred eighty-five thousand, nine hundred thirty-six".