381392740 has 24 divisors (see below), whose sum is σ = 814057272. Its totient is φ = 150055680.

The previous prime is 381392731. The next prime is 381392747. The reversal of 381392740 is 47293183.

It can be written as a sum of positive squares in 4 ways, for example, as 34762816 + 346629924 = 5896^2 + 18618^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 381392740.

It is not an unprimeable number, because it can be changed into a prime (381392747) by changing a digit.

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, 155089 + ... + 157528.

It is an arithmetic number, because the mean of its divisors is an integer number (33919053).

Almost surely, 2^381392740 is an apocalyptic number.

It is an amenable number.

381392740 is an abundant number, since it is smaller than the sum of its proper divisors (432664532).

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

381392740 is a wasteful number, since it uses less digits than its factorization.

381392740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312687 (or 312685 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 381392740 is about 19529.2790445526. The cubic root of 381392740 is about 725.1994631524.

The spelling of 381392740 in words is "three hundred eighty-one million, three hundred ninety-two thousand, seven hundred forty".