381287938 has 4 divisors (see below), whose sum is σ = 571931910. Its totient is φ = 190643968.

The previous prime is 381287927. The next prime is 381287939. The reversal of 381287938 is 839782183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 839782183 = 2719 ⋅308857.

It can be written as a sum of positive squares in only one way, i.e., 229431609 + 151856329 = 15147^2 + 12323^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 381287891 and 381287900.

It is not an unprimeable number, because it can be changed into a prime (381287939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95321983 + ... + 95321986.

Almost surely, 2^381287938 is an apocalyptic number.

381287938 is a deficient number, since it is larger than the sum of its proper divisors (190643972).

381287938 is a wasteful number, since it uses less digits than its factorization.

381287938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190643971.

The product of its digits is 580608, while the sum is 49.

The square root of 381287938 is about 19526.5956582298. The cubic root of 381287938 is about 725.1330317912.

The spelling of 381287938 in words is "three hundred eighty-one million, two hundred eighty-seven thousand, nine hundred thirty-eight".