381278390 has 16 divisors (see below), whose sum is σ = 691241040. Its totient is φ = 151413600.

The previous prime is 381278371. The next prime is 381278423. The reversal of 381278390 is 93872183.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135761 + ... + 138540.

It is an arithmetic number, because the mean of its divisors is an integer number (43202565).

Almost surely, 2^381278390 is an apocalyptic number.

381278390 is a deficient number, since it is larger than the sum of its proper divisors (309962650).

381278390 is a wasteful number, since it uses less digits than its factorization.

381278390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274447.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 381278390 is about 19526.3511696374. The cubic root of 381278390 is about 725.1269789482.

The spelling of 381278390 in words is "three hundred eighty-one million, two hundred seventy-eight thousand, three hundred ninety".