381173778 has 24 divisors (see below), whose sum is σ = 848198988. Its totient is φ = 123623712.

The previous prime is 381173777. The next prime is 381173783. The reversal of 381173778 is 877371183.

It can be written as a sum of positive squares in 2 ways, for example, as 378030249 + 3143529 = 19443^2 + 1773^2 .

It is not an unprimeable number, because it can be changed into a prime (381173777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 285501 + ... + 286832.

Almost surely, 2^381173778 is an apocalyptic number.

381173778 is an abundant number, since it is smaller than the sum of its proper divisors (467025210).

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

381173778 is a wasteful number, since it uses less digits than its factorization.

381173778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572378 (or 572375 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 381173778 is about 19523.6722467880. The cubic root of 381173778 is about 725.0606547748.

The spelling of 381173778 in words is "three hundred eighty-one million, one hundred seventy-three thousand, seven hundred seventy-eight".