381278336 has 16 divisors (see below), whose sum is σ = 759578190. Its totient is φ = 190639104.

The previous prime is 381278323. The next prime is 381278347. The reversal of 381278336 is 633872183.

It can be written as a sum of positive squares in only one way, i.e., 208513600 + 172764736 = 14440^2 + 13144^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 381278293 and 381278302.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1489241 + ... + 1489496.

Almost surely, 2^381278336 is an apocalyptic number.

It is an amenable number.

381278336 is a deficient number, since it is larger than the sum of its proper divisors (378299854).

381278336 is an equidigital number, since it uses as much as digits as its factorization.

381278336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2978751 (or 2978739 counting only the distinct ones).

The product of its digits is 145152, while the sum is 41.

The square root of 381278336 is about 19526.3497868905. The cubic root of 381278336 is about 725.1269447153.

The spelling of 381278336 in words is "three hundred eighty-one million, two hundred seventy-eight thousand, three hundred thirty-six".